Revert "[CMake] Unify scripts for generating VCS headers"

This reverts commits r352729 and r352731: this broke Sanitizer Windows bots

llvm-svn: 352733
diff --git a/lldb/source/lldb.cpp b/lldb/source/lldb.cpp
index 8613d03..2bf6a7a 100644
--- a/lldb/source/lldb.cpp
+++ b/lldb/source/lldb.cpp
@@ -11,9 +11,12 @@
 using namespace lldb;
 using namespace lldb_private;
 
-#include "VCSRevision.h"
 #include "clang/Basic/Version.h"
 
+#ifdef HAVE_SVN_VERSION_INC
+#include "SVNVersion.inc"
+#endif
+
 #ifdef HAVE_APPLE_VERSION_INC
 #include "AppleVersion.inc"
 #endif