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/AST/DeclBase.cpp b/lib/AST/DeclBase.cpp
index 574de16..ca67e28 100644
--- a/lib/AST/DeclBase.cpp
+++ b/lib/AST/DeclBase.cpp
@@ -20,6 +20,7 @@
 #include "clang/AST/Type.h"
 #include "llvm/ADT/DenseMap.h"
 #include <algorithm>
+#include <cstdio>
 #include <functional>
 #include <vector>
 using namespace clang;