refs #5206 fix mutex initializer to be compatible with osx

git-svn-id: file:///svn/toku/tokudb@45964 c7de825b-a66e-492c-adef-691d508d4ae1

ft/txn.cc

@@ -166,7 +166,7 @@ toku_txn_create_txn (
         .xa_xid = {0},
         .progress_poll_fun = NULL,
         .progress_poll_fun_extra = NULL,
-        .txn_lock = {{{0}}},
+        .txn_lock = ZERO_MUTEX_INITIALIZER,
         .open_fts = open_fts,
         .roll_info = roll_info,
         .state = TOKUTXN_LIVE,

portability/toku_pthread.h

@@ -35,6 +35,12 @@ typedef struct toku_mutex {
 #endif
 } toku_mutex_t;
 
+#if defined(__APPLE__)
+static const toku_mutex_t ZERO_MUTEX_INITIALIZER = {{0}};
+#else
+static const toku_mutex_t ZERO_MUTEX_INITIALIZER = {{{0}}};
+#endif
+
 static inline void
 toku_mutex_init(toku_mutex_t *mutex, const toku_pthread_mutexattr_t *attr) {
     int r = pthread_mutex_init(&mutex->pmutex, attr);