[Bug]: Running gen_release on a Mac results in a tar with lots of warnings

[jabraham17]

The script ./util/buildRelease/gen_release is whats used to generate the Chapel tarball release. If I run this script on my Mac, and then copy the tarball to a linux based system, untarring the archive results in a ton of garbarge being printed out

> tar xvzf chapel.tar.gz
....
ignoring unknown extended header LIBARCHIVE.xattr.com.apple.provenance
....

This is not really a correctness issue, as everything still works. But it does create a ton of extra output weird looking output. I think there is a flag --no-xattrs that can be used to avoid creating these extra headers in the tar file, but I am not sure how to apply that to the gen_release script with its very dense bash scripting.

[bradcray]

For typical usage, I'd imagine it'd just involve adding the flag to

chapel/util/buildRelease/gen_release

Line 292 in 6542f57

$cmd = "tar -cz -f $tarball_name @tarfiles";

For completeness, it may also be desireable to add it to

chapel/util/buildRelease/gen_release

Line 63 in 6542f57

SystemOrDie("cd $chplhome && tar -cf - . | (cd $archive_dir && tar -xf -)");

(I don't know how much, if at all, that branch is used today).