iOS: fix build on iOS
iOS: fix build on iOS

Currently, apps for iOS needs to be build through Xcode. So
disable building tools for now, until a proper solution is ready.

Change-Id: Ib31ad29d83c9043be94881e536975682adca4061
Reviewed-by: Tor Arne Vestbø <455e994b14f100bcf4496f5548752c1ff193cc50@digia.com>

kobolabs/qtquick1,kobolabs/qtquick1,kobolabs/qtquick1,kobolabs/qtquick1,kobolabs/qtquick1,kobolabs/qtquick1