catch signals on X11 systems to ensure clean shutdown
catch signals on X11 systems to ensure clean shutdown

VincentToups/lambdanative,gale320/lambdanative,attila-lendvai/lambdanative,VincentToups/lambdanative,VincentToups/lambdanative,emacstheviking/lambdanative,attila-lendvai/lambdanative,emacstheviking/lambdanative,attila-lendvai/lambdanative,youprofit/lambdanative,gale320/lambdanative,youprofit/lambdanative,VincentToups/lambdanative,youprofit/lambdanative,attila-lendvai/lambdanative,VincentToups/lambdanative,emacstheviking/lambdanative,gale320/lambdanative,attila-lendvai/lambdanative,youprofit/lambdanative,emacstheviking/lambdanative,youprofit/lambdanative,emacstheviking/lambdanative,gale320/lambdanative,gale320/lambdanative