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/libgd/package.sh

@@ -2,6 +2,8 @@
 port=libgd
 version=2.3.3
 useconfigure=true
+use_fresh_config_sub=true
+config_sub_path=build-aux/config.sub
 files="https://github.com/libgd/libgd/releases/download/gd-${version}/libgd-${version}.tar.gz libgd-${version}.tar.gz dd3f1f0bb016edcc0b2d082e8229c822ad1d02223511997c80461481759b1ed2"
 auth_type=sha256
 depends=("libpng")

Ports/libgd/patches/configure.patch

@@ -1,12 +0,0 @@
-diff -ruN libgd-2.3.3/config/config.sub libgd-2.3.3.patched/config/config.sub
---- libgd-2.3.3/config/config.sub	2021-09-11 01:12:11.000000000 -0400
-+++ libgd-2.3.3.patched/config/config.sub	2022-01-05 15:38:17.115307773 -0500
-@@ -1390,7 +1390,7 @@
- 	      | -powermax* | -dnix* | -nx6 | -nx7 | -sei* | -dragonfly* \
- 	      | -skyos* | -haiku* | -rdos* | -toppers* | -drops* | -es* \
- 	      | -onefs* | -tirtos* | -phoenix* | -fuchsia* | -redox* | -bme* \
--	      | -midnightbsd*)
-+	      | -midnightbsd* | -serenity*)
- 	# Remember, each alternative MUST END IN *, to match a version number.
- 		;;
- 	-qnx*)