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/gltron/patches/config.sub.patch

@@ -1,11 +0,0 @@
---- gltron-0.70/config.sub	2002-03-23 17:40:17.000000000 +0000
-+++ gltron-0.70-patched/config.sub	2022-01-09 23:05:14.342418312 +0000
-@@ -1070,7 +1070,7 @@
- 	      | -interix* | -uwin* | -rhapsody* | -darwin* | -opened* \
- 	      | -openstep* | -oskit* | -conix* | -pw32* | -nonstopux* \
- 	      | -storm-chaos* | -tops10* | -tenex* | -tops20* | -its* \
--	      | -os2* | -vos*)
-+	      | -os2* | -vos* | -serenity*)
- 	# Remember, each alternative MUST END IN *, to match a version number.
- 		;;
- 	-qnx*)