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/Analysis/ObjCRetSigs.m b/test/Analysis/ObjCRetSigs.m
index 3ee13e0..60a85fd 100644
--- a/test/Analysis/ObjCRetSigs.m
+++ b/test/Analysis/ObjCRetSigs.m
@@ -1,6 +1,6 @@
 // RUN: clang-cc -analyze -analyzer-experimental-internal-checks -warn-objc-methodsigs -verify %s
 
-#include <stdio.h>
+int printf(const char *, ...);
 
 @interface MyBase
 -(long long)length;