configure.ac: make xkb optional, as intended
authorPatrick Welche <prlw1@cam.ac.uk>
Thu, 24 Aug 2017 13:49:04 +0000 (14:49 +0100)
committerMike Gorse <mgorse@suse.com>
Sun, 27 Aug 2017 17:15:47 +0000 (12:15 -0500)
commitaa3a11a1dece49328e119f8465f0a46cd548b680
treed4c38715fc59ef5332dad25e0ef3f291d0e07542
parente8d4a02ec931a8d45a80357d8c04ef4cdfca013e
configure.ac: make xkb optional, as intended

[] is not sufficient to avoid PKG_CHECK_MODULES' default action of bailing if
xkbcommon-x11 is not found.
configure.ac