[Buildroot] [PATCH] sudo: fix install

[Simon Dawson]

> I've submitted a bug report to the sudo Bugzilla:
>
>  http://www.gratisoft.us/bugzilla/show_bug.cgi?id=560

The bug has now been fixed upstream (not by me) in commit 8209:0c4e3f68b2f5

Unfortunately, the fix will not appear until sudo 1.8.6 is released,
so we've still got a broken sudo package in Buildroot. I'm going to
submit an updated patch that backports the upstream fix, as an interim
solution until the release of sudo 1.8.6.