libhid: fix for nommu

Make it accept uclinux in the tuple as linux. Fixes:
http://autobuild.buildroot.net/results/07f/07f2a560d9915ff7bad830be11f95aa856ce0e73/



Upstream seems dead with the last commit in svn being 5+ years ago and
with some recent patches in the mailing list just sitting there.

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>