support FreeBSD

[dch]

I did this in line with the existing code for simplicity

• scripts are bash style, not posix shell, so make this explicit
• trim up trailing whitespace
• add FreeBSD architecture support

I think there may be simpler / cleaner ways to accommodate this
overall approach but this seems a good start.

Testing was done with:

Build type: Release
LuaJIT 2.1.1699801871

[dch]

If you plan to cross-build the rust libraries in CI or similar,
here's output of uname etc, the code might need to be amended
in that case.

# uname
FreeBSD

### now on x86_64
# uname -m
amd64

### now on aarch64
# uname -m
arm64

[dch]

NB the weird glyph is actually a light grey background >... visible whitespace. Not
quite sure how to hide/fix that?

[mistricky]

Hi @dch, thx for this PR, if you wanna support FreeBSD, you also need to update the github actions config. But I don't wanna add too many cross-compilation target. I only have 2000 minutes per month usage time for GitHub actions, and the mac CI expensive more :(

Cross-compile is just an option which allow most users to use CodeSnap.nvim out of box, if your OS not in the cross-compilation list, you can still compile CodeSnap.nvim from source use make build_generator command.

[mistricky]

NB the weird glyph is actually a light grey background >... visible whitespace. Not
quite sure how to hide/fix that?

Did you found the reproduce path? I can't reproduce this bug on my machine

[mistricky]

Hey @dch if you found reproduce path, you can open another issue to report it, this PR closed now.