common: Try XI 2.2 if XI 2.0 fails

The media-keys plugin calls supports_xinput2_devices(). That again calls
XIQueryDevice with a major/minor of 2.0. The upstream server has a check
for this in place and responds BadValue if a client initiates XI2 twice
with two different versions (such both us and GTK+ checking for
different versions). This happens here, and thus the plugin fails
to load.

The X server was fixed, but this is still required for older versions
of the Xi code:
http://cgit.freedesktop.org/xorg/xserver/commit/?id=ea51e9b2877df60135edaf2a8f88d0f2a2b41060

https://bugzilla.gnome.org/show_bug.cgi?id=673964