Add binaries for FreeBSD/OpenBSD/NetBSD

[chipsenkbeil]

Rust has targets for these that include armv7, aarch64, and x86_64.

aarch64-unknown-freebsd
aarch64-unknown-netbsd
aarch64-unknown-openbsd
armv6-unknown-freebsd
armv6-unknown-netbsd-eabihf
armv7-unknown-freebsd
armv7-unknown-netbsd-eabihf
i686-unknown-freebsd
i686-unknown-netbsd
i686-unknown-openbsd
powerpc-unknown-freebsd
powerpc-unknown-netbsd
powerpc-unknown-openbsd
powerpc64-unknown-freebsd
powerpc64-unknown-openbsd
powerpc64le-unknown-freebsd
riscv64gc-unknown-freebsd
riscv64gc-unknown-openbsd
sparc64-unknown-netbsd
sparc64-unknown-openbsd
x86_64-unknown-freebsd
x86_64-unknown-netbsd
x86_64-unknown-openbsd

[chipsenkbeil]

Can confirm that this builds on FreeBSD 13.1 within a Parallels instance on my M1 Mac, which means that the freebsd-unknown-aarch64 target works.

Packages needed:

• openssl
• gmake

Was able to do the following:

• distant launch ssh://user@ip to leverage ssh to launch a distant server within my Parallels VM from outside the VM
• distant shell to open up the default user shell
• distant fs read . to read the current directory

[chipsenkbeil]

To support building via a github action, we can use these actions to run within VMs for FreeBSD, OpenBSD, and NetBSD respectively:

• https://github.com/marketplace/actions/freebsd-vm
• https://github.com/marketplace/actions/openbsd-vm
• https://github.com/marketplace/actions/netbsd-vm

[chipsenkbeil]

OpenBSD 7.3 installation progress from getting it to run on my M1 Mac via Parallels:

• There is no rustup available for OpenBSD, so we install manually using pkg_add rust.
• openssl-src fails as no vendor for aarch64-unknown-openbsd

Resolving #193 would unblock.

[chipsenkbeil]

Possibly switch to https://github.com/cross-platform-actions/action, which also uses ssh to copy files between machines, but even supports arm64 version of OpenBSD.

Opened cross-platform-actions/action#55 to track getting aarch64 for FreeBSD/NetBSD available. If those became available, we wouldn't need to cross-compile!

[chipsenkbeil]

NetBSD cannot be built due to the same issue as android: termios. We can work towards leveraging a patch to get around that, but don't know what other issues might pop up.

OpenBSD cannot be built due to an internal compiler error. Adjusting LTO and other settings didn't appear to fix it. Going to close this out as we now have a build working for FreeBSD and I've left the progress for OpenBSD and NetBSD commented in the releases workflow.

[github-actions]

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