[Partial] Build wasi-libc for Windows (#2338)

Build wasi-libc library on Windows since libuv may be not supported. This PR is a first step
to make it working, but there's still a number of changes to get it fully working.

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

@@ -326,6 +326,61 @@ os_cond_broadcast(korp_cond *cond)
     return BHT_OK;
 }
 
+int
+os_rwlock_init(korp_rwlock *lock)
+{
+    assert(lock);
+
+    if (pthread_rwlock_init(lock, NULL) != BHT_OK)
+        return BHT_ERROR;
+
+    return BHT_OK;
+}
+
+int
+os_rwlock_rdlock(korp_rwlock *lock)
+{
+    assert(lock);
+
+    if (pthread_rwlock_rdlock(lock) != BHT_OK)
+        return BHT_ERROR;
+
+    return BHT_OK;
+}
+
+int
+os_rwlock_wrlock(korp_rwlock *lock)
+{
+    assert(lock);
+
+    if (pthread_rwlock_wrlock(lock) != BHT_OK)
+        return BHT_ERROR;
+
+    return BHT_OK;
+}
+
+int
+os_rwlock_unlock(korp_rwlock *lock)
+{
+    assert(lock);
+
+    if (pthread_rwlock_unlock(lock) != BHT_OK)
+        return BHT_ERROR;
+
+    return BHT_OK;
+}
+
+int
+os_rwlock_destroy(korp_rwlock *lock)
+{
+    assert(lock);
+
+    if (pthread_rwlock_destroy(lock) != BHT_OK)
+        return BHT_ERROR;
+
+    return BHT_OK;
+}
+
 int
 os_thread_join(korp_tid thread, void **value_ptr)
 {