openwrt package

[Habbie]

This currently sits on top of #145

TODO:

• bumping curl in openwrt would be cool as we can then use websockets without spending space on verbose messages
• add websocket support to the openwrt curl package
• upstream, or patch on our end, the quickjs-ng fenv stuff (https://git.musl-libc.org/cgit/musl/tree/arch/arm/bits/fenv.h). fixed: upstream already did it! bump quickjs-ng to fresh master, fixing our armv5 fenv issue #147
• figure out if, and why, we need all of TARGET_LDFLAGS += -latomic -static -lstdc++ -lgcc_eh. Especially that last one feels so wrong.

[Habbie]

As of the last commit, I managed to generate a binary that works on Toon, with working DNS. But this PR is not everything.

openwrt's curl package needs CONFIG_LIBCURL_WEBSOCKETS=y for it (a flag I added locally to the openwrt curl package), which in turn (as of their port of curl 8.10.1) needs CONFIG_LIBCURL_VERBOSE=y. I also manually bumped openwrt's meson to 1.6.1, although that might no longer be necessary now that we have bin2header.

I'll turn this into a github workflow which will serve as documentation for all changes needed to the environment outside of this PR.