CppTools: Split CppTools::UseBuiltin in two options

...for clarity.

No behavior change.

Change-Id: Id0334bc79b97a8ff53b37089e337530c9a01b1d4
Reviewed-by: Ivan Donchevskii <ivan.donchevskii@qt.io>
Reviewed-by: Marco Bubke <marco.bubke@qt.io>

src/plugins/clangtools/clangtoolruncontrol.cpp

@@ -193,7 +193,8 @@ static AnalyzeUnits toAnalyzeUnits(const FileInfos &fileInfos)
     for (const FileInfo &fileInfo : fileInfos) {
         CompilerOptionsBuilder optionsBuilder(*fileInfo.projectPart,
                                               UseSystemHeader::No,
-                                              UseBuiltin::Yes,
+                                              UseToolchainMacros::Yes,
+                                              UseTweakedHeaderPaths::Yes,
                                               UseLanguageDefines::No,
                                               QString(CLANG_VERSION),
                                               QString(CLANG_RESOURCE_DIR));