miniupnpc: drop obsolete FreeBSD patch

Didn't apply.  Tested build still works by building
pkgsCross.x86_64-freebsd.miniupnpc from x86_64-linux.

pkgs/tools/networking/miniupnpc/default.nix

@@ -15,8 +15,6 @@ stdenv.mkDerivation rec {
 
   nativeBuildInputs = [ cmake ];
 
-  patches = lib.optional stdenv.isFreeBSD ./freebsd.patch;
-
   doCheck = !stdenv.isFreeBSD;
 
   makeFlags = [ "PREFIX=$(out)" ];

pkgs/tools/networking/miniupnpc/freebsd.patch

@@ -1,11 +0,0 @@
-diff --git a/minihttptestserver.c b/minihttptestserver.c
-index bbfdac3..a43999d 100644
---- a/minihttptestserver.c
-+++ b/minihttptestserver.c
-@@ -1,3 +1,6 @@
-+#ifndef INADDR_LOOPBACK
-+#define INADDR_LOOPBACK         0x7f000001
-+#endif
- /* $Id: minihttptestserver.c,v 1.17 2015/02/06 10:31:19 nanard Exp $ */
-  /* Project : miniUPnP
-    * Author : Thomas Bernard