Use protected version of the malloc attribute in case source wants to
define malloc as macro.


git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@180727 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/__config b/include/__config
index 9136e00..389b6c4 100644
--- a/include/__config
+++ b/include/__config
@@ -423,7 +423,7 @@
 #endif
 
 #ifdef __GNUC__
-#define _NOALIAS __attribute__((malloc))
+#define _NOALIAS __attribute__((__malloc__))
 #else
 #define _NOALIAS
 #endif