Don't #include <stdio.h> when tests don't need it, or use clang instead of clang-cc when they do.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@89070 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Sema/block-storageclass.c b/test/Sema/block-storageclass.c
index 3d2527b..aacf8be 100644
--- a/test/Sema/block-storageclass.c
+++ b/test/Sema/block-storageclass.c
@@ -1,6 +1,6 @@
 // RUN: clang-cc %s -fsyntax-only -verify -fblocks
 
-#include <stdio.h>
+int printf(const char *, ...);
 void _Block_byref_release(void*src){}
 
 int main() {