This adds support for XCode 4 into qmake and also indirectly fixes a
couple of problems that are relevant for XCode 3.2 too
Task-number: QTBUG-17247
Change-Id: I722470ad1854bd740cbbd28ff4956057a0e1906b
Reviewed-by: David Forstenlechner <dforsten@gmail.com>
Reviewed-by: Morten Johan Sørvig <morten.sorvig@nokia.com>
(cherry picked from commit b5871311457ca97816c0abbb8b935570bbfb657c)
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@nokia.com>