pthread-barrier.h in libuv-3.2.2

- old
+ new

@@ -21,9 +21,10 @@
 #if !defined(__MVS__)
 #include <semaphore.h> /* sem_t */
 #endif
 
 #define PTHREAD_BARRIER_SERIAL_THREAD  0x12345
+#define UV__PTHREAD_BARRIER_FALLBACK   1
 
 /*
  * To maintain ABI compatibility with
  * libuv v1.x struct is padded according
  * to target platform