.gitignore: Add .valid files
.gitignore: Add .valid files

eyolfson/weston,jonnylamb/weston,Tarnyko/weston-xdg_surface_present,giucam/weston,Tarnyko/weston-xdg_surface_present,giucam/weston,udoprog/weston,eyolfson/weston,xorgy/weston,jonnylamb/weston,mchalupa/weston,Fantu/compositor-spice,sir-murray/weston,xorgy/weston,Gnurou/weston,Gnurou/weston,krezovic/weston,Fantu/compositor-spice,kwm81/weston,kwm81/weston,sir-murray/weston,udoprog/weston,krezovic/weston,mchalupa/weston,Fantu/compositor-spice