Allow any mode larger than requested dimensions
Allow any mode larger than requested dimensions

We were previously allowing only fullscreen modes which were exactly as
tall as the requested dimensions, perhaps erroneously.

ozkriff/glutin,mbrubeck/glutin,Ms2ger/glutin,tomaka/winit,tomaka/glutin,vberger/glutin,mbrubeck/glutin,notriddle/glutin,mitchmindtree/glutin,kornholi/glutin,nc4rrillo/glutin,mmatyas/glutin,servo/glutin,ecoal95/glutin,adambadawy/glutin,bvssvni/glutin