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/pkgconf/package.sh

@@ -4,7 +4,8 @@ version=1.8.0
 files="https://distfiles.dereferenced.org/pkgconf/pkgconf-${version}.tar.xz pkgconf-${version}.tar.xz ef9c7e61822b7cb8356e6e9e1dca58d9556f3200d78acab35e4347e9d4c2bbaf"
 auth_type=sha256
 useconfigure=true
-# FIXME: This looks suspiciously host-y... 
+use_fresh_config_sub=true
+# FIXME: This looks suspiciously host-y...
 configopts=("--prefix=/usr/local" "--with-pkg-config-dir=/usr/local/lib/pkgconfig")
 
 post_install() {

Ports/pkgconf/patches/build-system.patch

@@ -1,12 +0,0 @@
---- pkgconf-1.7.3/config.sub.orig	2020-10-13 18:51:42.736398026 +1100
-+++ pkgconf-1.7.3/config.sub	2020-10-13 18:51:45.953064825 +1100
-@@ -1393,7 +1393,8 @@
- 	      | -os2* | -vos* | -palmos* | -uclinux* | -nucleus* \
- 	      | -morphos* | -superux* | -rtmk* | -rtmk-nova* | -windiss* \
- 	      | -powermax* | -dnix* | -nx6 | -nx7 | -sei* | -dragonfly* \
--	      | -skyos* | -haiku* | -rdos* | -toppers* | -drops* | -es* | -tirtos*)
-+	      | -skyos* | -haiku* | -rdos* | -toppers* | -drops* | -es* | -tirtos* \
-+      	      | -serenity*)
- 	# Remember, each alternative MUST END IN *, to match a version number.
- 		;;
- 	-qnx*)