Set APP_THREAD_STACK_SIZE_DEFAULT/MIN for POSIX platforms (#779)

Set APP_THREAD_STACK_SIZE_DEFAULT/MIN to PTHREAD_STACK_DEFAULT/MIN
when the macros are defined.

Signed-off-by: zhouliang3 <zhouliang3@xiaomi.com>

core/config.h

@@ -263,13 +263,16 @@
 #define WASM_THREAD_AUX_STACK_SIZE_MIN (256)
 
 /* Default/min/max stack size of each app thread */
-#if !defined(BH_PLATFORM_ZEPHYR) && !defined(BH_PLATFORM_ALIOS_THINGS) \
-    && !defined(BH_PLATFORM_ESP_IDF) && !defined(BH_PLATFORM_OPENRTOS)
-#define APP_THREAD_STACK_SIZE_DEFAULT (32 * 1024)
-#define APP_THREAD_STACK_SIZE_MIN (24 * 1024)
-#else
+#if defined(BH_PLATFORM_ZEPHYR) || defined(BH_PLATFORM_ALIOS_THINGS) \
+    || defined(BH_PLATFORM_ESP_IDF) || defined(BH_PLATFORM_OPENRTOS)
 #define APP_THREAD_STACK_SIZE_DEFAULT (6 * 1024)
 #define APP_THREAD_STACK_SIZE_MIN (4 * 1024)
+#elif defined(PTHREAD_STACK_DEFAULT) && defined(PTHREAD_STACK_MIN)
+#define APP_THREAD_STACK_SIZE_DEFAULT   PTHREAD_STACK_DEFAULT
+#define APP_THREAD_STACK_SIZE_MIN       PTHREAD_STACK_MIN
+#else
+#define APP_THREAD_STACK_SIZE_DEFAULT (32 * 1024)
+#define APP_THREAD_STACK_SIZE_MIN (24 * 1024)
 #endif
 #if !defined(APP_THREAD_STACK_SIZE_MAX)
 #define APP_THREAD_STACK_SIZE_MAX (8 * 1024 * 1024)