libtirpc prior to 1.0.2 assumed that the system provided nis.h but this isn't
always true. Until now we've been using a tarball of the missing files from
Gentoo, but libtirpc 1.0.2 added a copy of nis.h to the sources so this isn't
required anymore.
(From OE-Core rev: e58b420a0e4ef62bd597ce286c9faea2a51913c4)
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>