file: report xxHash build-id and display any between 4 and 20 bytes long

[emaste]

Summary

LLVM's lld can generate an 8-byte xxHash Build-ID. Add it to the list of known lengths, and display the content of any Build-ID with a length between 4 and 20 bytes that does not correspond to a known type as "unknown".

[delphij]

The patch itself seems good, but have you contacted Christos for upstreaming? (He is quite good at adopting our patches, and this would also reduce our future work).

[emaste]

The patch itself seems good, but have you contacted Christos for upstreaming? (He is quite good at adopting our patches, and this would also reduce our future work).

I've tried to subscribe to the file mailing list so I can send patches there, but am waiting to be approved to join the list :(
I can try sending this patch directly to Christos as well.

[emaste]

Christos has committed it to the internal file repository.

I'm not sure when a new release is coming out. Should I commit this change to contrib, or do you want to just wait to have it come in from upstream?

[emaste]

Committed upstream and arrived in FreeBSD in rS308420