Fix WASI type/macro misalignments (#766)

Some of the WASI definitions in libc-wasi are out of sync with those of [wasi-libc](https://github.com/WebAssembly/wasi-libc/blob/main/libc-bottom-half/headers/public/wasi/api.h).

This PR fixed the misalignments of type __wasi_dirnamlen_t, __wasi_linkcount_t and __wasi_dirent_t, and WASI RIGHT related macros.

core/iwasm/libraries/libc-wasi/sandboxed-system-primitives/include/wasmtime_ssp.h

@@ -62,6 +62,8 @@ typedef uint64_t __wasi_device_t;
 typedef uint64_t __wasi_dircookie_t;
 #define __WASI_DIRCOOKIE_START (0)
 
+typedef uint32_t __wasi_dirnamlen_t;
+
 typedef uint16_t __wasi_errno_t;
 #define __WASI_ESUCCESS        (0)
 #define __WASI_E2BIG           (1)
@@ -182,7 +184,7 @@ typedef uint16_t __wasi_fstflags_t;
 
 typedef uint64_t __wasi_inode_t;
 
-typedef uint32_t __wasi_linkcount_t;
+typedef uint64_t __wasi_linkcount_t __attribute__((aligned(8)));
 
 typedef uint32_t __wasi_lookupflags_t;
 #define __WASI_LOOKUP_SYMLINK_FOLLOW (0x00000001)
@@ -198,35 +200,38 @@ typedef uint16_t __wasi_riflags_t;
 #define __WASI_SOCK_RECV_WAITALL (0x0002)
 
 typedef uint64_t __wasi_rights_t;
-#define __WASI_RIGHT_FD_DATASYNC             (0x0000000000000001)
-#define __WASI_RIGHT_FD_READ                 (0x0000000000000002)
-#define __WASI_RIGHT_FD_SEEK                 (0x0000000000000004)
-#define __WASI_RIGHT_FD_FDSTAT_SET_FLAGS     (0x0000000000000008)
-#define __WASI_RIGHT_FD_SYNC                 (0x0000000000000010)
-#define __WASI_RIGHT_FD_TELL                 (0x0000000000000020)
-#define __WASI_RIGHT_FD_WRITE                (0x0000000000000040)
-#define __WASI_RIGHT_FD_ADVISE               (0x0000000000000080)
-#define __WASI_RIGHT_FD_ALLOCATE             (0x0000000000000100)
-#define __WASI_RIGHT_PATH_CREATE_DIRECTORY   (0x0000000000000200)
-#define __WASI_RIGHT_PATH_CREATE_FILE        (0x0000000000000400)
-#define __WASI_RIGHT_PATH_LINK_SOURCE        (0x0000000000000800)
-#define __WASI_RIGHT_PATH_LINK_TARGET        (0x0000000000001000)
-#define __WASI_RIGHT_PATH_OPEN               (0x0000000000002000)
-#define __WASI_RIGHT_FD_READDIR              (0x0000000000004000)
-#define __WASI_RIGHT_PATH_READLINK           (0x0000000000008000)
-#define __WASI_RIGHT_PATH_RENAME_SOURCE      (0x0000000000010000)
-#define __WASI_RIGHT_PATH_RENAME_TARGET      (0x0000000000020000)
-#define __WASI_RIGHT_PATH_FILESTAT_GET       (0x0000000000040000)
-#define __WASI_RIGHT_PATH_FILESTAT_SET_SIZE  (0x0000000000080000)
-#define __WASI_RIGHT_PATH_FILESTAT_SET_TIMES (0x0000000000100000)
-#define __WASI_RIGHT_FD_FILESTAT_GET         (0x0000000000200000)
-#define __WASI_RIGHT_FD_FILESTAT_SET_SIZE    (0x0000000000400000)
-#define __WASI_RIGHT_FD_FILESTAT_SET_TIMES   (0x0000000000800000)
-#define __WASI_RIGHT_PATH_SYMLINK            (0x0000000001000000)
-#define __WASI_RIGHT_PATH_REMOVE_DIRECTORY   (0x0000000002000000)
-#define __WASI_RIGHT_PATH_UNLINK_FILE        (0x0000000004000000)
-#define __WASI_RIGHT_POLL_FD_READWRITE       (0x0000000008000000)
-#define __WASI_RIGHT_SOCK_SHUTDOWN           (0x0000000010000000)
+
+// Observe that WASI defines rights in the plural form
+// TODO - re-factor to use RIGHTS instead of RIGHT
+#define __WASI_RIGHT_FD_DATASYNC ((__wasi_rights_t)(1 << 0))
+#define __WASI_RIGHT_FD_READ ((__wasi_rights_t)(1 << 1))
+#define __WASI_RIGHT_FD_SEEK ((__wasi_rights_t)(1 << 2))
+#define __WASI_RIGHT_FD_FDSTAT_SET_FLAGS ((__wasi_rights_t)(1 << 3))
+#define __WASI_RIGHT_FD_SYNC ((__wasi_rights_t)(1 << 4))
+#define __WASI_RIGHT_FD_TELL ((__wasi_rights_t)(1 << 5))
+#define __WASI_RIGHT_FD_WRITE ((__wasi_rights_t)(1 << 6))
+#define __WASI_RIGHT_FD_ADVISE ((__wasi_rights_t)(1 << 7))
+#define __WASI_RIGHT_FD_ALLOCATE ((__wasi_rights_t)(1 << 8))
+#define __WASI_RIGHT_PATH_CREATE_DIRECTORY ((__wasi_rights_t)(1 << 9))
+#define __WASI_RIGHT_PATH_CREATE_FILE ((__wasi_rights_t)(1 << 10))
+#define __WASI_RIGHT_PATH_LINK_SOURCE ((__wasi_rights_t)(1 << 11))
+#define __WASI_RIGHT_PATH_LINK_TARGET ((__wasi_rights_t)(1 << 12))
+#define __WASI_RIGHT_PATH_OPEN ((__wasi_rights_t)(1 << 13))
+#define __WASI_RIGHT_FD_READDIR ((__wasi_rights_t)(1 << 14))
+#define __WASI_RIGHT_PATH_READLINK ((__wasi_rights_t)(1 << 15))
+#define __WASI_RIGHT_PATH_RENAME_SOURCE ((__wasi_rights_t)(1 << 16))
+#define __WASI_RIGHT_PATH_RENAME_TARGET ((__wasi_rights_t)(1 << 17))
+#define __WASI_RIGHT_PATH_FILESTAT_GET ((__wasi_rights_t)(1 << 18))
+#define __WASI_RIGHT_PATH_FILESTAT_SET_SIZE ((__wasi_rights_t)(1 << 19))
+#define __WASI_RIGHT_PATH_FILESTAT_SET_TIMES ((__wasi_rights_t)(1 << 20))
+#define __WASI_RIGHT_FD_FILESTAT_GET ((__wasi_rights_t)(1 << 21))
+#define __WASI_RIGHT_FD_FILESTAT_SET_SIZE ((__wasi_rights_t)(1 << 22))
+#define __WASI_RIGHT_FD_FILESTAT_SET_TIMES ((__wasi_rights_t)(1 << 23))
+#define __WASI_RIGHT_PATH_SYMLINK ((__wasi_rights_t)(1 << 24))
+#define __WASI_RIGHT_PATH_REMOVE_DIRECTORY ((__wasi_rights_t)(1 << 25))
+#define __WASI_RIGHT_PATH_UNLINK_FILE ((__wasi_rights_t)(1 << 26))
+#define __WASI_RIGHT_POLL_FD_READWRITE ((__wasi_rights_t)(1 << 27))
+#define __WASI_RIGHT_SOCK_SHUTDOWN ((__wasi_rights_t)(1 << 28))
 
 typedef uint16_t __wasi_roflags_t;
 #define __WASI_SOCK_RECV_DATA_TRUNCATED (0x0001)
@@ -292,7 +297,7 @@ struct argv_environ_values;
 typedef struct __wasi_dirent_t {
     __wasi_dircookie_t d_next;
     __wasi_inode_t d_ino;
-    uint32_t d_namlen;
+    __wasi_dirnamlen_t d_namlen;
     __wasi_filetype_t d_type;
 } __wasi_dirent_t __attribute__((aligned(8)));
 _Static_assert(offsetof(__wasi_dirent_t, d_next) == 0, "non-wasi data layout");
@@ -380,16 +385,16 @@ _Static_assert(offsetof(__wasi_filestat_t, st_ino) == 8, "non-wasi data layout")
 _Static_assert(
     offsetof(__wasi_filestat_t, st_filetype) == 16, "non-wasi data layout");
 _Static_assert(
-    offsetof(__wasi_filestat_t, st_nlink) == 20, "non-wasi data layout");
+    offsetof(__wasi_filestat_t, st_nlink) == 24, "non-wasi data layout");
 _Static_assert(
-    offsetof(__wasi_filestat_t, st_size) == 24, "non-wasi data layout");
+    offsetof(__wasi_filestat_t, st_size) == 32, "non-wasi data layout");
 _Static_assert(
-    offsetof(__wasi_filestat_t, st_atim) == 32, "non-wasi data layout");
+    offsetof(__wasi_filestat_t, st_atim) == 40, "non-wasi data layout");
 _Static_assert(
-    offsetof(__wasi_filestat_t, st_mtim) == 40, "non-wasi data layout");
+    offsetof(__wasi_filestat_t, st_mtim) == 48, "non-wasi data layout");
 _Static_assert(
-    offsetof(__wasi_filestat_t, st_ctim) == 48, "non-wasi data layout");
-_Static_assert(sizeof(__wasi_filestat_t) == 56, "non-wasi data layout");
+    offsetof(__wasi_filestat_t, st_ctim) == 56, "non-wasi data layout");
+_Static_assert(sizeof(__wasi_filestat_t) == 64, "non-wasi data layout");
 _Static_assert(_Alignof(__wasi_filestat_t) == 8, "non-wasi data layout");
 
 typedef struct __wasi_ciovec_t {