Ports: Update genemu's patches to use git patches

This required splitting the single patch file up, which was done with
_some_ degree of accuracy (but not entirely so).

Ports/genemu/patches/0004-Use-SDL2-for-SDL-includes.patch

@@ -0,0 +1,51 @@
+From 426933aab1632c89ecb75918f23baa9f0c279581 Mon Sep 17 00:00:00 2001
+From: Ali Mohammad Pur <ali.mpfard@gmail.com>
+Date: Mon, 16 May 2022 15:32:01 +0430
+Subject: [PATCH 4/5] Use <SDL2> for SDL includes
+
+---
+ gfx.cpp     | 2 +-
+ ioports.cpp | 2 +-
+ state.cpp   | 2 +-
+ 3 files changed, 3 insertions(+), 3 deletions(-)
+
+diff --git a/gfx.cpp b/gfx.cpp
+index 04daf6e..2848422 100644
+--- a/gfx.cpp
++++ b/gfx.cpp
+@@ -3,7 +3,7 @@
+ #include <assert.h>
+ #include <memory.h>
+ #include <stdio.h>
+-#include <SDL.h>
++#include <SDL2/SDL.h>
+ extern "C" {
+     #include "hw.h"
+ }
+diff --git a/ioports.cpp b/ioports.cpp
+index 9c3f14f..9295163 100644
+--- a/ioports.cpp
++++ b/ioports.cpp
+@@ -1,5 +1,5 @@
+ #include "mem.h"
+-#include <SDL.h>
++#include <SDL2/SDL.h>
+ extern "C" {
+         #include "hw.h"
+ }
+diff --git a/state.cpp b/state.cpp
+index 38bc547..aa70962 100644
+--- a/state.cpp
++++ b/state.cpp
+@@ -3,7 +3,7 @@
+ #include "vdp.h"
+ #include "cpu.h"
+ #include "hw.h"
+-#include <SDL.h>
++#include <SDL2/SDL.h>
+ 
+ extern "C" {
+     #include "m68k/m68k.h"
+-- 
+2.36.1
+