Temporarily revert parts of r136702 to make cmake builds happy.
Someone with more cmake experience want to throw me a bone? :)

llvm-svn: 136709
diff --git a/clang/lib/Driver/Driver.cpp b/clang/lib/Driver/Driver.cpp
index fc2ec67..9ecfb7c 100644
--- a/clang/lib/Driver/Driver.cpp
+++ b/clang/lib/Driver/Driver.cpp
@@ -373,8 +373,8 @@
 void Driver::generateCompilationDiagnostics(Compilation &C,
                                             const Command *FailingCommand) {
   Diag(clang::diag::note_drv_command_failed_diag_msg)
-    << "Please submit a bug report to " BUG_REPORT_URL " and include command"
-    " line arguments and all diagnostic information.";
+    << "Please submit a bug report and include command line arguments and "
+    "all diagnostic information.";
 
   // Suppress driver output and emit preprocessor output to temp file.
   CCCIsCPP = true;