package/x11r7/xapp_xkbcomp: bump version to 1.4.5

Release notes:
https://lists.x.org/archives/xorg-announce/2021-March/003075.html

Update license hash after upstream removed trailing whitespaces:
https://cgit.freedesktop.org/xorg/app/xkbcomp/commit/COPYING?id=3b3d25dd32ba48fd6d15ca98baf7109af21e1d97



Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>