[Linux] Fallback if Xrandr is missing
[Linux] Fallback if Xrandr is missing

If Xrandr is missing, virtual-screen-size is the same as screen-size

hostilefork/rebol,rgchris/ren-c,draegtun/ren-c,giuliolunati/ren-c,hostilefork/rebol,rgchris/ren-c,kealist/ren-c,codebybrett/ren-c,rgchris/ren-c,draegtun/ren-c,giuliolunati/ren-c,rgchris/ren-c,hostilefork/rebol,codebybrett/ren-c,codebybrett/ren-c,mbk/ren-c,hostilefork/rebol,draegtun/ren-c,hostilefork/rebol,kealist/ren-c,codebybrett/ren-c,draegtun/ren-c,rgchris/ren-c,kealist/ren-c,mbk/ren-c,draegtun/ren-c,kealist/ren-c,giuliolunati/ren-c,mbk/ren-c,draegtun/ren-c,mbk/ren-c,kealist/ren-c,codebybrett/ren-c,giuliolunati/ren-c,codebybrett/ren-c,hostilefork/rebol,kealist/ren-c,giuliolunati/ren-c