Roll libxml to 2.9.3

third_party/libxml/src/threads.c

Index: third_party/libxml/src/threads.c
diff --git a/third_party/libxml/src/threads.c b/third_party/libxml/src/threads.c
index 8921204b3c2eef6ac917297c564664dfe13731ad..b9d6cae35333830e3ea72f766c5e2838ee43dac5 100644
--- a/third_party/libxml/src/threads.c
+++ b/third_party/libxml/src/threads.c
@@ -47,7 +47,7 @@
 #ifdef HAVE_PTHREAD_H
 
 static int libxml_is_threaded = -1;
-#ifdef __GNUC__
+#if defined(__GNUC__) && defined(__GLIBC__)
 #ifdef linux
 #if (__GNUC__ == 3 && __GNUC_MINOR__ >= 3) || (__GNUC__ > 3)
 extern int pthread_once (pthread_once_t *__once_control,
@@ -89,7 +89,7 @@ extern int pthread_cond_signal ()
 	   __attribute((weak));
 #endif
 #endif /* linux */
-#endif /* __GNUC__ */
+#endif /* defined(__GNUC__) && defined(__GLIBC__) */
 #endif /* HAVE_PTHREAD_H */
 
 /*
@@ -415,8 +415,8 @@ xmlRMutexUnlock(xmlRMutexPtr tok ATTRIBUTE_UNUSED)
     pthread_mutex_unlock(&tok->lock);
 #elif defined HAVE_WIN32_THREADS
     if (tok->count > 0) {
-        LeaveCriticalSection(&tok->cs);
 	tok->count--;
+        LeaveCriticalSection(&tok->cs);
     }
 #elif defined HAVE_BEOS_THREADS
     if (tok->lock->tid == find_thread(NULL)) {