Switched '-angle' to '-opengl dynamic'

Change-Id: Ic3ee711ef0f1b975efc0e5689a498dbe765d2d2e
Reviewed-by: Iikka Eklund <iikka.eklund@theqtcompany.com>
Enable C++11 for the Mac OS X builds.

Remove "-no-c++11"

This brings the OS X packages in line with the other
platforms. The minimum deployment target is now 10.7,
10.6 support is no longer holding us back in this
regard.

Change-Id: I72893989c06b0e2a95e22580a57f924e2fc75c93
Task-number: QTBUG-41809
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@digia.com>