Link to CoreFoundation in macjp2 plugin

This fixes a linking error on tvOS (though strangely not macOS).

Change-Id: I1f339fefa07ab55bc943aabf895f713e8ef6f6c1
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@theqtcompany.com>
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@theqtcompany.com>

src/plugins/imageformats/macjp2/macjp2.pro

@@ -2,7 +2,7 @@ TARGET  = qmacjp2
 PLUGIN_TYPE = imageformats
 PLUGIN_CLASS_NAME = QMacJp2Plugin
 
-LIBS += -framework ImageIO
+LIBS += -framework CoreFoundation -framework ImageIO
 
 QT += core-private gui-private platformsupport-private