tests: Use -ffreestanding when including stdint.h, to avoid platform dependencies.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@113301 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Misc/predefines.c b/test/Misc/predefines.c
index 8e57c80..87f676e 100644
--- a/test/Misc/predefines.c
+++ b/test/Misc/predefines.c
@@ -1,4 +1,4 @@
-/* RUN: %clang_cc1 -fsyntax-only -verify -std=c89 -pedantic-errors %s
+/* RUN: %clang_cc1 -fsyntax-only -verify -std=c89 -ffreestanding -pedantic-errors %s
  * rdar://6814950
  */
 #include <stdint.h>