Clang: Minor cleanups in CompilerOptionsBuilder

Change-Id: Iaf5af70136bceed52d19622c01d9d7147e5abeea
Reviewed-by: Ivan Donchevskii <ivan.donchevskii@qt.io>

src/plugins/clangcodemodel/clangeditordocumentprocessor.cpp

@@ -476,7 +476,7 @@ private:
         }
 
         CppTools::CompilerOptionsBuilder builder(m_projectPart);
-        builder.updateLanguageOption(fileKind);
+        builder.updateFileLanguage(fileKind);
 
         m_options.append(builder.options());
     }