Fix waking up mac event loop from thread.
Fix waking up mac event loop from thread.

mmatyas/glutin,mvdnes/glutin,tomaka/glutin,nc4rrillo/glutin,ozkriff/glutin,tempbottle/glutin,Jayflux/glutin,adambadawy/glutin,notriddle/glutin,retep998/glutin,servo/glutin,fkaa/glutin,robertknight/glutin,mbrubeck/glutin,TimNN/glutin,mbrubeck/glutin,larsbergstrom/glutin,ecoal95/glutin,nox/glutin,vvuk/glutin,paulrouget/glutin,christopheraugustus/glutin,vberger/glutin,bvssvni/glutin,aepsil0n/glutin,mneumann/glutin,Ms2ger/glutin,kornholi/glutin,tomaka/winit,glennw/glutin,mitchmindtree/glutin