nis: update yp-tools and ypbind

Both yp-tools and ypbind-mt were out of date with their latest released
versions, so bump them up to current.  Remove two dead patches at the same
time and reorganize the recipes to better follow the preferred OE style.
Finally, the new release includes a new version of the GPLv2 COPYING file,
with a significant amount of whitespace fixes, so update the license
checksum.

Signed-off-by: Joe MacDonald <joe_macdonald@mentor.com>