Ports: Remove some config.sub patches and download a fresh one if needed

All of these patches did the same thing, which is already in upstream
config.sub.
With this change, we need only add `use_fresh_config_sub=true` to
the package.sh file.
Note that this is not done automatically in case the port has a modified
config.sub file.

Ports/SDL2_gfx/package.sh

@@ -6,6 +6,7 @@ files="https://downloads.sourceforge.net/project/sdl2gfx/SDL2_gfx-${version}.tar
 auth_type=sha256
 depends=("SDL2")
 useconfigure=true
+use_fresh_config_sub=true
 configopts=("--with-sdl-prefix=${SERENITY_INSTALL_ROOT}/usr/local")
 
 install() {

Ports/SDL2_gfx/patches/fix-autoconf.patch

@@ -1,11 +0,0 @@
---- SDL2_gfx-1.0.4/config.sub	2021-04-04 18:40:50.418255684 +0200
-+++ SDL2_gfx-1.0.4/config.sub	2021-04-04 18:42:32.801888295 +0200
-@@ -1355,7 +1355,7 @@
- 	      | -os2* | -vos* | -palmos* | -uclinux* | -nucleus* \
- 	      | -morphos* | -superux* | -rtmk* | -rtmk-nova* | -windiss* \
- 	      | -powermax* | -dnix* | -nx6 | -nx7 | -sei* | -dragonfly* \
--	      | -skyos* | -haiku* | -rdos* | -toppers* | -drops* | -es*)
-+	      | -skyos* | -haiku* | -rdos* | -toppers* | -drops* | -es* | -serenity*)
- 	# Remember, each alternative MUST END IN *, to match a version number.
- 		;;
- 	-qnx*)