Support target x86_64-unknown-linux-musl

[lgalabru]

See stacks-network/stacks-core#3243 (comment)

[jcnelson]

I'm not sure how tractable this is to fix, because it happens in the deno dependency. Here are the relevant parts of cargo build:

$ cargo build
<snip>
error: failed to add native library /home/jude/pkg/clarinet/target/debug/gn_out/obj/librusty_v8.a: file too small to be an archive

error: could not compile `rusty_v8` due to previous error
warning: build failed, waiting for other jobs to finish...
error: build failed

I traced this to this issue here, which has been open since Dec 2019.

[lgalabru]

Related #560

[hugocaillard]

Deno (and especially our outdated version) brings many compilation issues.
To be re-assessed once we remove Deno as part of #1065

[lgalabru]

Clarinet 2 is out, closing now!