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/m4/package.sh

@@ -2,6 +2,7 @@
 port=m4
 version=1.4.9
 useconfigure=true
+use_fresh_config_sub=true
 files="https://ftpmirror.gnu.org/gnu/m4/m4-${version}.tar.gz m4-${version}.tar.gz
 https://ftpmirror.gnu.org/gnu/m4/m4-${version}.tar.gz.sig m4-${version}.tar.gz.sig
 https://ftpmirror.gnu.org/gnu/gnu-keyring.gpg gnu-keyring.gpg"

Ports/m4/patches/configure.patch

@@ -1,14 +0,0 @@
-diff --git a/config.sub b/config.sub
-index 5defff6..040fb4b 100755
---- a/config.sub
-+++ b/config.sub
-@@ -1222,7 +1222,8 @@ case $os in
- 	      | -os2* | -vos* | -palmos* | -uclinux* | -nucleus* \
- 	      | -morphos* | -superux* | -rtmk* | -rtmk-nova* | -windiss* \
- 	      | -powermax* | -dnix* | -nx6 | -nx7 | -sei* | -dragonfly* \
--	      | -skyos* | -haiku* | -rdos* | -toppers* | -drops*)
-+	      | -skyos* | -haiku* | -rdos* | -toppers* | -drops* \
-+             | -serenity*)
- 	# Remember, each alternative MUST END IN *, to match a version number.
- 		;;
- 	-qnx*)