Base: define os_unfair_lock as CFLock_t

On Windows, `CFLock_t` is already an unfair lock.  Simply add some
macros to use `CFLock_t` on Windows as it is not as lightweight on
Darwin.

Author: compnerd

CoreFoundation/Base.subproj/CFInternal.h

@@ -585,6 +585,11 @@ typedef pthread_mutex_t os_unfair_lock;
 typedef pthread_mutex_t * os_unfair_lock_t;
 static void os_unfair_lock_lock(os_unfair_lock_t lock) { pthread_mutex_lock(lock); }
 static void os_unfair_lock_unlock(os_unfair_lock_t lock) { pthread_mutex_unlock(lock); }
+#elif defined(_WIN32)
+#define OS_UNFAIR_LOCK_INIT CFLockInit
+#define os_unfair_lock CFLock_t
+#define os_unfair_lock_lock __CFLock
+#define os_unfair_lock_unlock __CFUnlock
 #endif // __has_include(<os/lock.h>)
 
 #if !__HAS_DISPATCH__