Ports: Update ffmpeg's patches to use git patches

Ports/ffmpeg/patches/0001-Assume-that-EDOM-exists.patch

@@ -0,0 +1,27 @@
+From d64d7a469a8524d2ea8121d10844ff73feef3b55 Mon Sep 17 00:00:00 2001
+From: Peter Ross <pross@xvid.org>
+Date: Tue, 1 Mar 2022 19:50:19 +1100
+Subject: [PATCH] Assume that EDOM exists
+
+Since errno values are not numeric constants on serenity, this won't
+work in cpp, assume that it exists.
+---
+ libavutil/error.h | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/libavutil/error.h b/libavutil/error.h
+index 0d3269a..a54d80d 100644
+--- a/libavutil/error.h
++++ b/libavutil/error.h
+@@ -37,7 +37,7 @@
+ 
+ 
+ /* error handling */
+-#if EDOM > 0
++#if 1
+ #define AVERROR(e) (-(e))   ///< Returns a negative error code from a POSIX error code, to return from library functions.
+ #define AVUNERROR(e) (-(e)) ///< Returns a POSIX error code from a library function error return value.
+ #else
+-- 
+2.36.1
+