include clang's config.h unconditionally (v2)

And remove HAVE_CLANG_CONFIG_H, now that the header is generated
in the autoconf build, too.

Reverts r149571/restores r149504, now that config.h is generated
correctly by LLVM's configure in all build configurations.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@150487 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Driver/ToolChains.cpp b/lib/Driver/ToolChains.cpp
index 8c7158f..703c7aa 100644
--- a/lib/Driver/ToolChains.cpp
+++ b/lib/Driver/ToolChains.cpp
@@ -33,11 +33,7 @@
 
 #include <cstdlib> // ::getenv
 
-#ifdef HAVE_CLANG_CONFIG_H
-# include "clang/Config/config.h"
-#endif
-
-#include "llvm/Config/config.h" // for GCC_INSTALL_PREFIX
+#include "clang/Config/config.h" // for GCC_INSTALL_PREFIX
 
 using namespace clang::driver;
 using namespace clang::driver::toolchains;