include: Increase the number of max. input devices to 256.
Extending the decade old f0124ed9, to increase the number of input devices from 40 to 256. 40 translates at most 9 MD, while 256 will allow 63 MD. It is an arbitrary number, but people are hitting the current limit under reasonable conditions. Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=64793 Signed-off-by: Arthur Williams <email@example.com> (cherry picked from commit fe439596)