Ports: Update sl's patches to use git patches

Ports/sl/patches/0001-Add-an-install-target.patch

@@ -0,0 +1,27 @@
+From 71f2cc48a3e66377763401054c663ca6a2a3f7ca Mon Sep 17 00:00:00 2001
+From: Gunnar Beutner <gbeutner@serenityos.org>
+Date: Thu, 15 Apr 2021 15:43:18 +0200
+Subject: [PATCH] Add an install target
+
+Co-Authored-By: Noah Rosamilia <ivoahivoah@gmail.com>
+---
+ Makefile | 6 ++++++
+ 1 file changed, 6 insertions(+)
+
+diff --git a/Makefile b/Makefile
+index c3005d2..04fcb9d 100644
+--- a/Makefile
++++ b/Makefile
+@@ -18,3 +18,9 @@ clean:
+ 	rm -f sl
+ 
+ distclean: clean
++
++install: all
++	mkdir -p ${DESTDIR}/usr/local/bin
++	install sl ${DESTDIR}/usr/local/bin/sl
++	mkdir -p ${DESTDIR}/usr/local/share/man/man1
++	gzip -9 -c < sl.1 > ${DESTDIR}/usr/local/share/man/man1/sl.1.gz
+-- 
+2.36.1
+

Ports/sl/patches/ReadMe.md

@@ -0,0 +1,8 @@
+# Patches for sl on SerenityOS
+
+## `0001-Add-an-install-target.patch`
+
+Add an install target
+
+
+

Ports/sl/patches/serenity-changes.patch

@@ -1,14 +0,0 @@
-diff --git a/Makefile b/Makefile
-index c3005d2..e071fc9 100644
---- a/Makefile
-+++ b/Makefile
-@@ -18,3 +18,9 @@ clean:
- 	rm -f sl
- 
- distclean: clean
-+
-+install: all
-+	mkdir -p ${DESTDIR}/usr/local/bin
-+	install sl ${DESTDIR}/usr/local/bin/sl
-+	mkdir -p ${DESTDIR}/usr/local/share/man/man1
-+	gzip -9 -c < sl.1 > ${DESTDIR}/usr/local/share/man/man1/sl.1.gz