Fix #4471 start LWJGL3 on the first thread on Mac
Fix #4471 start LWJGL3 on the first thread on Mac

LWJGL3 needs to be started on the first thread on Mac, because
only the first thread can process input and user events.
sarkanyi/libgdx,ttencate/libgdx,MovingBlocks/libgdx,czyzby/libgdx,kotcrab/libgdx,FredGithub/libgdx,BlueRiverInteractive/libgdx,alex-dorokhov/libgdx,MikkelTAndersen/libgdx,codepoke/libgdx,fwolff/libgdx,sarkanyi/libgdx,alex-dorokhov/libgdx,sarkanyi/libgdx,josephknight/libgdx,MikkelTAndersen/libgdx,MovingBlocks/libgdx,MovingBlocks/libgdx,realitix/libgdx,codepoke/libgdx,bladecoder/libgdx,kotcrab/libgdx,czyzby/libgdx,sarkanyi/libgdx,Zomby2D/libgdx,realitix/libgdx,BlueRiverInteractive/libgdx,stinsonga/libgdx,cypherdare/libgdx,czyzby/libgdx,js78/libgdx,tommyettinger/libgdx,codepoke/libgdx,samskivert/libgdx,kotcrab/libgdx,libgdx/libgdx,fwolff/libgdx,realitix/libgdx,czyzby/libgdx,sarkanyi/libgdx,josephknight/libgdx,hyvas/libgdx,ttencate/libgdx,stinsonga/libgdx,codepoke/libgdx,ttencate/libgdx,js78/libgdx,MikkelTAndersen/libgdx,realitix/libgdx,FredGithub/libgdx,js78/libgdx,MovingBlocks/libgdx,NathanSweet/libgdx,alex-dorokhov/libgdx,bladecoder/libgdx,stinsonga/libgdx,hyvas/libgdx,josephknight/libgdx,czyzby/libgdx,js78/libgdx,hyvas/libgdx,ttencate/libgdx,libgdx/libgdx,ttencate/libgdx,bladecoder/libgdx,samskivert/libgdx,BlueRiverInteractive/libgdx,js78/libgdx,Zomby2D/libgdx,MovingBlocks/libgdx,FredGithub/libgdx,josephknight/libgdx,cypherdare/libgdx,FredGithub/libgdx,kotcrab/libgdx,NathanSweet/libgdx,hyvas/libgdx,fwolff/libgdx,josephknight/libgdx,codepoke/libgdx,tommyettinger/libgdx,alex-dorokhov/libgdx,fwolff/libgdx,samskivert/libgdx,FredGithub/libgdx,MikkelTAndersen/libgdx,realitix/libgdx,alex-dorokhov/libgdx,codepoke/libgdx,Zomby2D/libgdx,josephknight/libgdx,codepoke/libgdx,js78/libgdx,BlueRiverInteractive/libgdx,BlueRiverInteractive/libgdx,bladecoder/libgdx,Zomby2D/libgdx,stinsonga/libgdx,hyvas/libgdx,fwolff/libgdx,js78/libgdx,Zomby2D/libgdx,kotcrab/libgdx,MovingBlocks/libgdx,hyvas/libgdx,czyzby/libgdx,ttencate/libgdx,fwolff/libgdx,tommyettinger/libgdx,sarkanyi/libgdx,alex-dorokhov/libgdx,libgdx/libgdx,MikkelTAndersen/libgdx,BlueRiverInteractive/libgdx,tommyettinger/libgdx,realitix/libgdx,cypherdare/libgdx,BlueRiverInteractive/libgdx,fwolff/libgdx,NathanSweet/libgdx,libgdx/libgdx,alex-dorokhov/libgdx,kotcrab/libgdx,FredGithub/libgdx,kotcrab/libgdx,MovingBlocks/libgdx,BlueRiverInteractive/libgdx,tommyettinger/libgdx,hyvas/libgdx,realitix/libgdx,MikkelTAndersen/libgdx,sarkanyi/libgdx,MikkelTAndersen/libgdx,libgdx/libgdx,cypherdare/libgdx,bladecoder/libgdx,czyzby/libgdx,realitix/libgdx,kotcrab/libgdx,samskivert/libgdx,josephknight/libgdx,samskivert/libgdx,MovingBlocks/libgdx,czyzby/libgdx,hyvas/libgdx,js78/libgdx,stinsonga/libgdx,ttencate/libgdx,josephknight/libgdx,ttencate/libgdx,sarkanyi/libgdx,MikkelTAndersen/libgdx,FredGithub/libgdx,samskivert/libgdx,cypherdare/libgdx,codepoke/libgdx,alex-dorokhov/libgdx,NathanSweet/libgdx,samskivert/libgdx,NathanSweet/libgdx,FredGithub/libgdx,samskivert/libgdx,fwolff/libgdx