Don't build QtLocation on Mac OSX10.8 (force success)

Qt3D doesn't build (required by QtLocation). This is
a workaround for QTBUG-32312.

Task-number: QTBUG-32312
Change-Id: I212ed7451dfb0308b9bc695f8ac91aab7508e49a
Reviewed-by: Sergio Ahumada <sergio.ahumada@digia.com>
Reviewed-by: Tony Sarajärvi <tony.sarajarvi@digia.com>