Push down forcesuccess for macx-clang_bin-pkg-config_OSX_10.7

Also remove some unused files for Qt5_{dev,stable}_Integration,
as they don't have this configuration set up.

Task-number: QTQAINFRA-625
Change-Id: Ie03e24e18f729c447b6350b2dce9b2f01ba4d021
Reviewed-by: Simo Fält <simo.falt@digia.com>