Add some <cstdio> includes to unbreak the buildbots

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@98591 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Rewrite/Rewriter.cpp b/lib/Rewrite/Rewriter.cpp
index 84c0979..50f9fa1 100644
--- a/lib/Rewrite/Rewriter.cpp
+++ b/lib/Rewrite/Rewriter.cpp
@@ -18,6 +18,7 @@
 #include "clang/Lex/Lexer.h"
 #include "clang/Basic/SourceManager.h"
 #include "llvm/Support/raw_ostream.h"
+#include <cstdio>
 using namespace clang;
 
 void RewriteBuffer::RemoveText(unsigned OrigOffset, unsigned Size) {