xspice: make --cgdb non magical, use XSPICE_ENABLE_GDB
xspice: make --cgdb non magical, use XSPICE_ENABLE_GDB

fgouget/xf86-video-qxl,fgouget/xf86-video-qxl,fgouget/xf86-video-qxl,facboy/xserver-xorg-video-qxl,fgouget/xf86-video-qxl,dezelin/xf86-video-qxl,facboy/xserver-xorg-video-qxl,facboy/xserver-xorg-video-qxl,sombrafam/virtioqxl-xf86-video-qxl,sombrafam/virtioqxl-xf86-video-qxl,dezelin/xf86-video-qxl,dezelin/xf86-video-qxl,sombrafam/virtioqxl-xf86-video-qxl,facboy/xserver-xorg-video-qxl