package/sudo: drop unneeded autoreconf

Commit 4fea71ac (package/sudo: security bump to version 1.9.5p2)
removed the patch, but forgot to remove the now unneeded autoreconf.  Fix
that.

Reported-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>