Ports: Use GNU patch instead of the OpenBSD version

The OpenBSD version is having some weird issues, so:

Reject OpenBSD, return to GNU.

Ports/AvailablePorts.md

@@ -130,7 +130,7 @@ Please make sure to keep this list up to date when adding and updating ports. :^
 | [`opentyrian-data`](opentyrian-data/)  | OpenTyrian graphics and audio                                   | 1.0.0                    | https://camanis.net/tyrian/tyrian21.zip                                        |
 | [`oksh`](oksh/)                        | oksh                                                            | 7.0                      | https://github.com/ibara/oksh                                                  |
 | [`p7zip`](p7zip/)                      | p7zip                                                           | 17.04                    | https://github.com/jinfeihan57/p7zip                                           |
-| [`patch`](patch/)                      | patch (OpenBSD)                                                 | 6.6                      | https://github.com/ibara/libpuffy                                              |
+| [`patch`](patch/)                      | patch (GNU)                                                     | 2.7.6                    | https://savannah.gnu.org/projects/patch/                                       |
 | [`pcre`](pcre/)                        | Perl-compatible Regular Expressions (PCRE)                      | 8.45                     | https://www.pcre.org/                                                          |
 | [`pcre2`](pcre2/)                      | Perl-compatible Regular Expressions (PCRE2)                     | 10.39                    | https://www.pcre.org/                                                          |
 | [`php`](php/)                          | PHP                                                             | 8.0.10                   | https://www.php.net/                                                           |

Ports/patch/package.sh

@@ -1,6 +1,6 @@
 #!/usr/bin/env -S bash ../.port_include.sh
 port=patch
-version=6.6
-files="https://github.com/ibara/libpuffy/releases/download/libpuffy-1.0/patch-${version}.tar.gz patch-${version}.tar.gz b82ba726d9bdb683534839673f0c845d4f97c8d08490fa53dbef502665fee637"
+version=2.7.6
+useconfigure=true
+files="https://ftp.gnu.org/gnu/patch/patch-${version}.tar.gz patch-${version}.tar.gz 8cf86e00ad3aaa6d26aca30640e86b0e3e1f395ed99f189b06d4c9f74bc58a4e"
 auth_type=sha256
-depends=("libpuffy")

Ports/patch/patches/fix-config-sub.patch

@@ -0,0 +1,12 @@
+diff -ur a/build-aux/config.sub b/build-aux/config.sub
+--- a/build-aux/config.sub	2018-02-03 13:41:53.000000000 +0100
++++ b/build-aux/config.sub	2021-11-10 01:22:51.034188104 +0100
+@@ -1363,7 +1363,7 @@
+ 	# The portable systems comes first.
+ 	# Each alternative MUST end in a * to match a version number.
+ 	# -sysv* is not here because it comes later, after sysvr4.
+-	-gnu* | -bsd* | -mach* | -minix* | -genix* | -ultrix* | -irix* \
++	-gnu* | -bsd* | -mach* | -minix* | -genix* | -ultrix* | -serenity* | -irix* \
+ 	      | -*vms* | -sco* | -esix* | -isc* | -aix* | -cnk* | -sunos | -sunos[34]*\
+ 	      | -hpux* | -unos* | -osf* | -luna* | -dgux* | -auroraux* | -solaris* \
+ 	      | -sym* | -kopensolaris* | -plan9* \

Ports/patch/patches/remove-oversized-dirfd-cache.patch

@@ -0,0 +1,14 @@
+diff -ur a/src/safe.c b/src/safe.c
+--- a/src/safe.c	2018-02-03 13:41:49.000000000 +0100
++++ b/src/safe.c	2021-11-10 02:05:04.152449983 +0100
+@@ -98,9 +98,7 @@
+ {
+   struct rlimit nofile;
+ 
+-  max_cached_fds = 8;
+-  if (getrlimit (RLIMIT_NOFILE, &nofile) == 0)
+-    max_cached_fds = MAX (nofile.rlim_cur / 4, max_cached_fds);
++  max_cached_fds = 64;
+ 
+   cached_dirfds = hash_initialize (max_cached_fds,
+ 				   NULL,