Testconfig: Adding macx-ios-clang_OSX_10.8 for qt5 dev projects

Added macx-ios-clang_OSX_10.8 stage for all qt5 submodules
dev projects. Forced to succeed, please remove properties once
passed on ci for the first time.

Change-Id: Ieb5d3e8668e358d9e972833a916c4fa571a6c6b2
Reviewed-by: Sergio Ahumada <sergio.ahumada@digia.com>