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/libatomic_ops/package.sh

@@ -3,5 +3,6 @@
 port=libatomic_ops
 version=7.6.10
 useconfigure=true
+use_fresh_config_sub=true
 files="https://www.hboehm.info/gc/gc_source/libatomic_ops-${version}.tar.gz libatomic_ops-${version}.tar.gz 587edf60817f56daf1e1ab38a4b3c729b8e846ff67b4f62a6157183708f099af"
 auth_type=sha256

Ports/libatomic_ops/patches/fix-autoconf.patch

@@ -1,12 +0,0 @@
---- libatomic_ops-7.6.10/config.sub	2021-07-18 14:24:53.950762337 +0100
-+++ libatomic_ops-7.6.10/config.sub	2021-07-18 14:25:19.341651925 +0100
-@@ -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*)