Fix AOT compilation on MacOS (#3102)

After #2995, AOT may stop working properly on arm MacOS:
```bash
wasm-micro-runtime/core/iwasm/common/wasm_runtime_common.c,
line 1270, WASM module load failed
AOT module load failed: mmap memory failed
```
That's because, without `#include <TargetConditionals.h>`, `TARGET_OS_OSX` is undefined,
since it's definition is in that header file.

Author: eloparco

core/shared/platform/common/posix/posix_memmap.c

@@ -7,6 +7,7 @@
 
 #if defined(__APPLE__) || defined(__MACH__)
 #include <libkern/OSCacheControl.h>
+#include <TargetConditionals.h>
 #endif
 
 #ifndef BH_ENABLE_TRACE_MMAP

core/shared/platform/common/posix/posix_thread.c

@@ -9,6 +9,10 @@
 #include "platform_api_vmcore.h"
 #include "platform_api_extension.h"
 
+#if defined(__APPLE__) || defined(__MACH__)
+#include <TargetConditionals.h>
+#endif
+
 typedef struct {
     thread_start_routine_t start;
     void *arg;