OSX FreeType: respect hinting preference

Task-number: QTBUG-42839
Change-Id: I2bccd7bda74ccbbb752181f1caea7ecf4672c01c
Reviewed-by: Morten Johan Sørvig <morten.sorvig@theqtcompany.com>

src/platformsupport/fontdatabases/mac/qcoretextfontdatabase.mm

@@ -994,6 +994,7 @@ QFontEngine *QCoreTextFontDatabase::freeTypeFontEngine(const QFontDef &fontDef,
         qWarning() << "QCoreTextFontDatabase::freeTypefontEngine Failed to create engine";
         return Q_NULLPTR;
     }
+    engine->setQtDefaultHintStyle(static_cast<QFont::HintingPreference>(fontDef.hintingPreference));
 
     return engine.take();
 }