Updated data submodule
MacOSX: Add initial support in CMake build infra
Include the OpenAL headers using the "al.h" form, as recommended by its CMake finder script
Fix system_other implementation by adding an Init() and fixing the wrong const
Added option to force to use bundled gmock/gtest

 * resolves problem when version of gmock/gtest found installed in system
   disagrees with the bundled one
 * removed -DGTEST_HAVE_PTHREAD=0, seems that pthread is needed after all
Fix for CMakeLists error
Include SDL.h in main.cpp to make sure the main loop is SDL's main loop

This allows the MacOSX program to start.
Add libintl library to the unit tests on Mac OSX