it fixes the uninstallation directory of the core for Mac OS X and iOS, as they were different from the installation directory;
it introduces a variable for the installation directory of the core dir, which allows people building it to specify a different directory, but defaults to the current value so that nothing should break;
The second one would make our lives a bit easier in GNOME Games.
This pull request does two things:
The second one would make our lives a bit easier in GNOME Games.