build: Add patch for libgpod mac build.

Store patch file in repository rather than relying on strawberry's file
server.

Reference: 27955cc441

.github/workflows/all.yml

@@ -902,9 +902,8 @@ jobs:
           cd libgpod-0.8.3
           wget https://raw.githubusercontent.com/macports/macports-ports/master/multimedia/libgpod/files/autogen.sh
           wget https://raw.githubusercontent.com/macports/macports-ports/master/multimedia/libgpod/files/patch-tools-generic-callout.c.diff
-          wget http://files.strawberrymusicplayer.org/patches/libgpod-libplist.patch
           patch -p0 < patch-tools-generic-callout.c.diff
-          patch -p1 < libgpod-libplist.patch
+          patch -p1 < $GITHUB_WORKSPACE/3rdparty/libgpod/patches/0001-Look-for-libplist-2.0.patch
           chmod u+x autogen.sh
           ./autogen.sh
           ./configure --disable-more-warnings \

3rdparty/libgpod/patches/0001-Look-for-libplist-2.0.patch

@@ -0,0 +1,25 @@
+From 27955cc4415c39f520f3674c9d1989d28e9b8670 Mon Sep 17 00:00:00 2001
+From: Jonas Kvinge <jonas@jkvinge.net>
+Date: Wed, 5 May 2021 20:10:28 +0200
+Subject: [PATCH 1/2] Look for libplist-2.0
+
+---
+ configure.ac | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/configure.ac b/configure.ac
+index c4ffeaf..8052fa2 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -42,7 +42,7 @@ AC_CHECK_FUNCS([localtime_r])
+ AC_CHECK_MEMBERS([struct tm.tm_gmtoff],,,[#include <time.h>])
+ dnl sqlite3 is needed for newer ipod models (nano5g), and libplist is needed 
+ dnl by libgpod sqlite code
+-PKG_CHECK_MODULES(LIBGPOD, glib-2.0 >= 2.16.0 gobject-2.0 sqlite3 libplist >= 1.0 gmodule-2.0)
++PKG_CHECK_MODULES(LIBGPOD, glib-2.0 >= 2.16.0 gobject-2.0 sqlite3 libplist-2.0 gmodule-2.0)
+ 
+ dnl ***************************************************
+ dnl The following functions are only available starting
+-- 
+2.31.1
+