Work around a build error in a very hackish way.

ui::CreateInputMethod()'s second parameter is not a pointer. 0 does not make
things much better either, but this is an area we are not particularly
interested in at the moment.
wayland.gyp: Lower Mesa and Wayland version requirements.

Require at least the versions currently available in Tizen IVI, otherwise
the build will just fail. We are not entirely sure everything works with
those slightly old Wayland and Mesa versions, but doing this should at least
allow us to create RPMs to test.

Fixes #110.