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/libexpat/package.sh

@@ -2,6 +2,7 @@
 port=libexpat
 version=2.2.9
 useconfigure=true
+use_fresh_config_sub=true
 files="https://github.com/libexpat/libexpat/releases/download/R_2_2_9/expat-${version}.tar.xz expat-${version}.tar.xz
 https://github.com/libexpat/libexpat/releases/download/R_2_2_9/expat-${version}.tar.xz.asc expat-${version}.tar.xz.asc"
 workdir=expat-${version}

Ports/libexpat/patches/fix-autoconf.patch

@@ -1,22 +0,0 @@
---- a/conftools/config.sub
-+++ b/conftools/config.sub
-@@ -2,7 +2,7 @@
- # Configuration validation subroutine script.
- #   Copyright 1992-2018 Free Software Foundation, Inc.
-
--timestamp='2018-01-01'
-+timestamp='2019-10-03'
-
- # This file is free software; you can redistribute it and/or modify it
- # under the terms of the GNU General Public License as published by
-@@ -1409,6 +1409,7 @@ case $os in
- 	# Each alternative MUST end in a * to match a version number.
- 	# -sysv* is not here because it comes later, after sysvr4.
- 	-gnu* | -bsd* | -mach* | -minix* | -genix* | -ultrix* | -irix* \
-+	      | -serenity* \
- 	      | -*vms* | -sco* | -esix* | -isc* | -aix* | -cnk* | -sunos | -sunos[34]*\
- 	      | -hpux* | -unos* | -osf* | -luna* | -dgux* | -auroraux* | -solaris* \
- 	      | -sym* | -kopensolaris* | -plan9* \
---
-2.17.1
-