Avoid redefining WASMMemoryType (#3602)

core/iwasm/include/wasm_export.h

@@ -81,8 +81,11 @@ typedef struct WASMTableType *wasm_table_type_t;
 struct WASMGlobalType;
 typedef struct WASMGlobalType *wasm_global_type_t;
 
+#ifndef WASM_MEMORY_T_DEFINED
+#define WASM_MEMORY_T_DEFINED
 struct WASMMemory;
 typedef struct WASMMemory WASMMemoryType;
+#endif
 typedef WASMMemoryType *wasm_memory_type_t;
 
 typedef struct wasm_import_t {

core/iwasm/interpreter/wasm.h

@@ -518,7 +518,11 @@ typedef struct WASMMemory {
     uint32 num_bytes_per_page;
     uint32 init_page_count;
     uint32 max_page_count;
-} WASMMemory, WASMMemoryType;
+} WASMMemory;
+#ifndef WASM_MEMORY_T_DEFINED
+#define WASM_MEMORY_T_DEFINED
+typedef struct WASMMemory WASMMemoryType;
+#endif
 
 typedef struct WASMTableImport {
     char *module_name;