improve compatibility with GCC 4.4, patch by Michel Salim (PR3697)


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@65884 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Frontend/InitHeaderSearch.cpp b/lib/Frontend/InitHeaderSearch.cpp
index e7dd207..6383c20 100644
--- a/lib/Frontend/InitHeaderSearch.cpp
+++ b/lib/Frontend/InitHeaderSearch.cpp
@@ -19,6 +19,7 @@
 #include "llvm/ADT/SmallPtrSet.h"
 #include "llvm/System/Path.h"
 #include "llvm/Config/config.h"
+#include <cstdio>
 #include <vector>
 using namespace clang;