Clang: Improve speed by content generation

The argument parsing has some considerable overhead. We try to avoid that
with merging all content together in one file.

Change-Id: Icf426bb5d6a5569d59c180f94c7eab66a22a251c
Reviewed-by: Tim Jenssen <tim.jenssen@qt.io>

src/plugins/cpptools/clangcompileroptionsbuilder.h

@@ -40,7 +40,6 @@ public:
                              const QString &clangVersion,
                              const QString &clangResourceDirectory);
 
-protected:
     ClangCompilerOptionsBuilder(const ProjectPart &projectPart,
                                 const QString &clangVersion,
                                 const QString &clangResourceDirectory);
@@ -58,7 +57,6 @@ protected:
     void addProjectConfigFileInclude();
 
     void addExtraOptions();
-
 private:
     QString clangIncludeDirectory() const;