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.
Suggest always 64M swap partition for minidumps necessity
Revert "Suggest always 64M swap partition for minidumps necessity" -- This will break more than it helps. Needs some more thought/discussion.

This reverts commit 46d8e48a405d42b7596f8184395d8e2c4f808ca4.
Update radns to latest version that builds fine

It helps ticket #1836
Merge pull request #99 from matsimon/patch-cleanups

Patch cleanups
Add TCP_SIGNATURE back to kernels to support MD5 for bgp and friends.