evtest: add as a seperate package

Evtest is nowadays maintained as a seperate package by Peter Hutterer.

The project doesn't release any tarballs, so use the one of Fedora instead
so we don't need to autoreconf:

http://comments.gmane.org/gmane.comp.freedesktop.xorg.announce/1671



Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>