patches/RELENG_8_3: Definitley delete "various_8.2_fixes" patch

A patch that I'm not confident it definitely is part of FreeBSD 8.3
onwards. It was disabled anyway longer time.
patches/RELENG_8_2 & 8_3: Delete if.c.diff, not used for long time.

This patch has been last seen enabled in patches.RELENG_2_0 and
RELENG_8_0. It was initially committed for 7.2-based pfSense builds in:

Author: Scott Ullrich <sullrich@pfsense.org>
Date:   Sat Sep 5 16:47:40 2009 -0400

    Adding patch to 7.2 / 2.0 that will not delete a static route
    when interface is being downed

Since it has not been enabled for a longer period of time and no one
(as per forums) as yet yelled out, let's get rid of it.
Merge pull request #99 from matsimon/patch-cleanups

Patch cleanups