[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/include/platform_api_extension.h

@@ -238,6 +238,56 @@ os_cond_signal(korp_cond *cond);
 int
 os_cond_broadcast(korp_cond *cond);
 
+/**
+ * Initialize readwrite lock object
+ *
+ * @param cond [OUTPUT] pointer to a lock object variable
+ *
+ * @return 0 if success
+ */
+int
+os_rwlock_init(korp_rwlock *lock);
+
+/**
+ * Acquire the read lock
+ *
+ * @param lock lock variable
+ *
+ * @return 0 if success
+ */
+int
+os_rwlock_rdlock(korp_rwlock *lock);
+
+/**
+ * Acquire the write lock
+ *
+ * @param lock lock variable
+ *
+ * @return 0 if success
+ */
+int
+os_rwlock_wrlock(korp_rwlock *lock);
+
+/**
+ * Unlocks the lock object
+ *
+ * @param lock lock variable
+ *
+ * @return 0 if success
+ */
+int
+os_rwlock_unlock(korp_rwlock *lock);
+
+/**
+ * Destroy a lock object
+ *
+ * @param lock lock variable
+ *
+ * @return 0 if success
+ */
+int
+os_rwlock_destroy(korp_rwlock *lock);
+
 /**
  * Creates a new POSIX-like semaphore or opens an existing
  * semaphore.  The semaphore is identified by name.  For details of