Update wasi-libc version in CI and implement custom sync primitives (#2028)

Update wasi-libc version to resolve the hang issue when running wasi-threads cases.

Implement custom sync primitives as a counterpart of `pthread_barrier_wait` to
attempt to replace pthread sync primitives since they seem to cause data races
when running with the thread sanitizer.

core/iwasm/libraries/lib-wasi-threads/test/common.h

@@ -6,11 +6,16 @@
 #include <stdlib.h>
 #include <stdio.h>
 #include <assert.h>
-#include <pthread.h>
 #include <stdbool.h>
 #include <unistd.h>
 #include <limits.h>
 
+#if USE_CUSTOM_SYNC_PRIMITIVES != 0
+#include "sync_primitives.h"
+#else
+#include <pthread.h>
+#endif
+
 #include "wasi_thread_start.h"
 
 typedef enum {