Ports: Add libogg

This library will allow us to port more multimedia programs and games,
since it's a common dependency of such projects. I was looking at
Scummvm's dependencies in particular, with a goal of porting them all
eventually, so that we can have Myst running in Serenity!

Ports/AvailablePorts.md

@@ -39,6 +39,7 @@ Please make sure to keep this list up to date when adding and updating ports. :^
 | [`libffi`](libffi/)            | libffi                                        | 3.3               | https://www.sourceware.org/libffi/                    |
 | [`libiconv`](libiconv/)        | GNU libiconv                                  | 1.16              | https://www.gnu.org/software/libiconv/                |
 | [`libjpeg`](libjpeg/)          | libjpeg                                       | 9d                | https://ijg.org/                                      |
+| [`libogg`](libogg/)            | libogg                                        | 1.3.4             | https://github.com/xiph/ogg                           |
 | [`libpng`](libpng/)            | libpng                                        | 1.6.37            | https://libpng.org/                                   |
 | [`libpuffy`](libpuffy/)        | libpuffy                                      | 1.0               | https://github.com/ibara/libpuffy                     |
 | [`libtiff`](libtiff/)          | libtiff                                       | 4.2.0             | http://www.libtiff.org/                               |

Ports/libogg/package.sh

@@ -0,0 +1,6 @@
+#!/usr/bin/env -S bash ../.port_include.sh
+port=libogg
+version=1.3.4
+useconfigure=true
+files="https://github.com/xiph/ogg/releases/download/v${version}/libogg-${version}.tar.gz libogg-${version}.tar.gz"
+workdir="libogg-${version}"

Ports/libogg/patches/configure.patch

@@ -0,0 +1,12 @@
+diff -ru libogg-1.3.4/config.sub libogg-1.3.4-patched/config.sub
+--- libogg-1.3.4/config.sub	2021-03-08 15:40:56.932153900 +0100
++++ libogg-1.3.4-patched/config.sub	2021-03-08 15:40:43.633856800 +0100
+@@ -1333,7 +1333,7 @@
+ 	# 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* | esix* | aix* | cnk* | sunos | sunos[34]*\
+ 	     | hpux* | unos* | osf* | luna* | dgux* | auroraux* | solaris* \
+ 	     | sym* | kopensolaris* | plan9* \