remove unneeded config.h includes



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@147195 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/tools/libclang/CIndexer.cpp b/tools/libclang/CIndexer.cpp
index 995a8fe..d458789 100644
--- a/tools/libclang/CIndexer.cpp
+++ b/tools/libclang/CIndexer.cpp
@@ -21,7 +21,7 @@
 #include "clang/Basic/Version.h"
 #include "clang/Sema/CodeCompleteConsumer.h"
 #include "llvm/ADT/StringExtras.h"
-#include "llvm/Config/config.h"
+#include "llvm/Config/llvm-config.h"
 #include "llvm/Support/Compiler.h"
 #include "llvm/Support/MemoryBuffer.h"
 #include "llvm/Support/raw_ostream.h"