Fix win32 window not having a destructor in headless mode
Fix win32 window not having a destructor in headless mode

mvdnes/glutin,notriddle/glutin,mbrubeck/glutin,tempbottle/glutin,Ms2ger/glutin,TimNN/glutin,mbrubeck/glutin,AnthIste/glutin,Jayflux/glutin,vberger/glutin,ecoal95/glutin,glennw/glutin,servo/glutin,TyOverby/glutin,robertknight/glutin,mneumann/glutin,tomaka/glutin,ozkriff/glutin,christopheraugustus/glutin,kornholi/glutin,vvuk/glutin,aepsil0n/glutin,bvssvni/glutin,jdm/glutin,pcwalton/glutin,fkaa/glutin,nox/glutin,mitchmindtree/glutin,tomaka/winit,adambadawy/glutin,akiss77/glutin,paulrouget/glutin,nc4rrillo/glutin,frewsxcv/glutin,larsbergstrom/glutin,mmatyas/glutin,retep998/glutin