jemalloc: Only replace _pthread_mutex_init_calloc_cb in private namespace

When we're not doing the private namespace remap, we don't need to do
this pragma. This is needed for the bootstrapping path when we import a
new version of jemalloc.

No functional change.

Sponsored by:		Netflix

Author: bsdimp

contrib/jemalloc/src/mutex.c

@@ -42,6 +42,7 @@ pthread_create(pthread_t *__restrict thread,
 JEMALLOC_EXPORT int	_pthread_mutex_init_calloc_cb(pthread_mutex_t *mutex,
     void *(calloc_cb)(size_t, size_t));
 
+#ifndef JEMALLOC_NO_PRIVATE_NAMESPACE
 #pragma weak _pthread_mutex_init_calloc_cb
 int
 _pthread_mutex_init_calloc_cb(pthread_mutex_t *mutex,
@@ -53,6 +54,7 @@ _pthread_mutex_init_calloc_cb(pthread_mutex_t *mutex,
 	    calloc_cb));
 }
 #endif
+#endif
 
 void
 malloc_mutex_lock_slow(malloc_mutex_t *mutex) {