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/dropbear/package.sh

@@ -8,6 +8,7 @@ https://mirror.dropbear.nl/mirror/releases/dropbear-key-2015.asc dropbear-key-20
 auth_type="sig"
 auth_opts=("--keyring" "./dropbear-key-2015.asc" "dropbear-${version}.tar.bz2.asc")
 useconfigure=true
+use_fresh_config_sub=true
 # don't care about zlib, less deps is better
 configopts=("--disable-zlib")
 # Serenity's utmp is not fully compatible with what dropbear expects.

Ports/dropbear/patches/fix-autoconf.patch

@@ -1,10 +0,0 @@
---- a/config.sub.orig
-+++ b/config.sub
-@@ -1339,6 +1339,7 @@
- 	# 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* | esix* | aix* | cnk* | sunos | sunos[34]*\
- 	     | hpux* | unos* | osf* | luna* | dgux* | auroraux* | solaris* \
- 	     | sym* | kopensolaris* | plan9* \