Wasm module is now not built for Amazon Linux 2, Debian 11 and Ubuntu
2.0.04, since it requires cmake version newer than what's available on
those OSes.  wasm-wasi-component is not affected.

This directory is needed for contribs to function.

Probably not needed now...

Signed-off-by: Andrew Clayton <a.clayton@nginx.com>

FreeBSD introduced sha512sum binary in version 14, but with slightly
incompatible flags as compared to Linux version.  This change makes it
work in both worlds.

njs changed strings API so now instead of njs_vm_value_string_set() used
njs_vm_value_string_create() as a drop-in replacement.

Link: <https://github.com/nginx/njs/commit/5730d5ffe23a4965c001d873695d22005fcfa588>

While at it, follow the njs move to github to fetch sources.

The lists of files being unpacked are mostly useless but take a
significant amount of lines and bytes in e.g. CI jobs.  E.g. in rhel9
packaging job, it's 39680 lines just for the unpacking of
wasmtime-v11.0.1-src, as compared to total 48945 lines of output.

This change makes NJS module incompatible with NJS older than 0.8.3.
Therefore, the configuration version check has been adjusted accordingly.

This change was introduced in NJS 0.8.3 here:
<https://hg.nginx.com/njs/rev/ad1a7ad3c715>