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/sed/package.sh

@@ -2,6 +2,8 @@
 port=sed
 version=4.2.1
 useconfigure="true"
+use_fresh_config_sub="true"
+config_sub_path=build-aux/config.sub
 files="https://ftpmirror.gnu.org/gnu/sed/sed-${version}.tar.bz2 sed-${version}.tar.bz2
 https://ftpmirror.gnu.org/gnu/sed/sed-${version}.tar.bz2.sig sed-${version}.tar.bz2.sig
 https://ftpmirror.gnu.org/gnu/gnu-keyring.gpg gnu-keyring.gpg"

Ports/sed/patches/config.sub.patch

@@ -1,11 +0,0 @@
---- ./build-aux/config.sub	2009-06-15 10:05:11.000000000 +0100
-+++ ./build-aux/config.sub.sos	2020-01-24 10:43:44.561780477 +0000
-@@ -1269,7 +1269,7 @@
- 	-gnu* | -bsd* | -mach* | -minix* | -genix* | -ultrix* | -irix* \
- 	      | -*vms* | -sco* | -esix* | -isc* | -aix* | -cnk* | -sunos | -sunos[34]*\
- 	      | -hpux* | -unos* | -osf* | -luna* | -dgux* | -solaris* | -sym* \
--	      | -kopensolaris* \
-+	      | -kopensolaris* | -serenity* \
- 	      | -amigaos* | -amigados* | -msdos* | -newsos* | -unicos* | -aof* \
- 	      | -aos* | -aros* \
- 	      | -nindy* | -vxsim* | -vxworks* | -ebmon* | -hms* | -mvs* \