Make definition of CXTranslationUnitImpl private
to libclang.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@119585 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/tools/libclang/CXCursor.cpp b/tools/libclang/CXCursor.cpp
index ea9cfdf..841e297 100644
--- a/tools/libclang/CXCursor.cpp
+++ b/tools/libclang/CXCursor.cpp
@@ -13,6 +13,7 @@
 //
 //===----------------------------------------------------------------------===//
 
+#include "CXTranslationUnit.h"
 #include "CXCursor.h"
 #include "CXString.h"
 #include "clang/Frontend/ASTUnit.h"