Ports: Update SDLPoP's patches to use git patches

Ports/SDLPoP/patches/0004-Fix-SDL2-include-path.patch

@@ -0,0 +1,31 @@
+From ddde9196a6a165ff06ac725c567f7e9aebe1d4a8 Mon Sep 17 00:00:00 2001
+From: Gunnar Beutner <gunnar@beutner.name>
+Date: Mon, 19 Apr 2021 16:17:10 +0200
+Subject: [PATCH 4/4] Fix SDL2 include path
+
+SDL2 headers are installed into /usr/local under SDL2, make it so
+they're found.
+---
+ src/CMakeLists.txt | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
+index 3558a6c..d074e48 100644
+--- a/src/CMakeLists.txt
++++ b/src/CMakeLists.txt
+@@ -14,10 +14,10 @@ set(CMAKE_RUNTIME_OUTPUT_DIRECTORY "${SDLPoP_SOURCE_DIR}/..")
+ 
+ # On macOS, if you used Homebrew to install SDL2, the location may be something like this:
+ 
+-#set(SDL2 "/usr/local/Cellar/sdl2/2.0.5")
++set(SDL2 "/usr/local")
+ 
+ if (NOT(WIN32) AND (DEFINED SDL2))
+-    include_directories(${SDL2}/include)
++    include_directories(${SDL2}/include/SDL2)
+     link_directories(${SDL2}/lib)
+ endif()
+ 
+-- 
+2.36.1
+