Add support for Watchguard Firewall X750e

See merge request !8

when running opkg update, this currently results in errors like this:

Downloading https://downloads.openwrt.org/releases/22.03-SNAPSHOT/packages/arm_cortex-a7_neon-vfpv4/base/Packages.gz
wget: SSL support not available, please install one of the libustream-.*[ssl|tls] packages as well as the ca-bundle and ca-certificates packages.
*** Failed to download the package list from https://downloads.openwrt.org/releases/22.03-SNAPSHOT/packages/arm_cortex-a7_neon-vfpv4/base/Packages.gz

since we already have wolfssl for hostapd stuff, just install
libustream-wolfssl and ca-certificates.

Build fails with it, let's see if we need it.

Sometimes, there are untracked files left in the dl directory, which
another job already commited in the DL cache. git pull will then fail
becaue it won't overwrite untracked files.

By first pulling (which will fail), then commiting and pulling again we
will avoid this situation.