Some of these functions should use locks although they didn't show up
as needing locks at runtime (using valgrind's helgrind), as some aren't
called often or aren't used at all. Add locks for correctness & to
prevent errors in the future.
- GHOST_SystemWayland::disposeContext
- GHOST_SystemWayland::getAllDisplayDimensions
- GHOST_SystemWayland::getButtons
- GHOST_SystemWayland::getMainDisplayDimensions
- GHOST_SystemWayland::getNumDisplays
- GHOST_WindowWayland::setWindowCustomCursorShape
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