Log Message:
net/nagios-base: Remove rss-newsfeed.html from SPECIAL_PERMS.

The rss-newsfeed.html file was removed in the update to version
4.3.2, so we no longer need to change ownership and permissions on
the file after installation.

Arguably, nagios-base should have a postinstall check for the
rss-newsfeed.* files and remove them, as they were removed in
version 4.3.2 due to security concerns.