Add make check target for iOS

Enabling check target to run test apps in iPhone simulator.

Task-number: QTBUG-36639
Change-Id: I700d998fe9f1a6c910431789e98e4789d820f3e4
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>
Reviewed-by: Tony Sarajärvi <tony.sarajarvi@digia.com>
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@digia.com>