spiceqxl: Recognize the same set of boolean values as in xorg.conf.
spiceqxl: Recognize the same set of boolean values as in xorg.conf.

Issue a warning for invalid values but treat them as TRUE for backward compatibility.

Signed-off-by: Francois Gouget <6b915da68578f6eb004fe99432b967565fc9be8f@codeweavers.com>

fgouget/xf86-video-qxl,fgouget/xf86-video-qxl,fgouget/xf86-video-qxl,fgouget/xf86-video-qxl