nixpkgs

461e4a7e - xorg-server: security 1.19.4 -> 1.19.5

xorg-server: security 1.19.4 -> 1.19.5 CVE-2017-{12176,12177,12178,12183} (cherry picked from commit 2baf618c3ee503b20fd55f0ba92b325a976de730)