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/libsixel/package.sh

@@ -3,6 +3,7 @@ port=libsixel
 version=1.8.6
 files="https://github.com/saitoha/libsixel/archive/refs/tags/v${version}.tar.gz ${port}-${version}.tar.gz 37611d60c7dbcee701346967336dbf135fdd5041024d5f650d52fae14c731ab9"
 useconfigure=true
+use_fresh_config_sub=true
 auth_type=sha256
 configopts=("--prefix=${SERENITY_INSTALL_ROOT}/usr/local")
 

Ports/libsixel/patches/config.sub.patch

@@ -1,13 +0,0 @@
-diff --git a/config.sub b/config.sub
-index 9ccf09a..3f638ab 100755
---- a/config.sub
-+++ b/config.sub
-@@ -1390,7 +1390,7 @@ case $os in
- 	      | -powermax* | -dnix* | -nx6 | -nx7 | -sei* | -dragonfly* \
- 	      | -skyos* | -haiku* | -rdos* | -toppers* | -drops* | -es* \
- 	      | -onefs* | -tirtos* | -phoenix* | -fuchsia* | -redox* | -bme* \
--	      | -midnightbsd*)
-+	      | -midnightbsd* | -serenity*)
- 	# Remember, each alternative MUST END IN *, to match a version number.
- 		;;
- 	-qnx*)