Locale support for bsdtar

[alexnovak]

The bsdtar supplied with bazel-lib doesn't support unicode in mtree files.

Bsdtar does seem to support locales, but only when compiled with HAVE_SETLOCALE https://github.com/libarchive/libarchive/blob/40ff837717b89e9a5d2c735758f503d124d17b72/tar/bsdtar.c#L190-L192

In the libarchive compilation that underpins this, it seems like we're configuring this for libarchive, but perhaps it isn't making its way to the bsdtar compilation? bazelbuild/bazel-central-registry@6050102#diff-7362d45a2c906ff9c0922ff1f104e88aa28197d9345dabbc18a7a5740f3959e6R1352

Does it also have to depend on //:config? I'm not particularly familiar with bazel cc rules.

[alexnovak]

Looking into this further, I've confirmed that we are correctly compiling with HAVE_SETLOCALE. This looks like it actually might be an issue with how libarchive interprets mtree
https://github.com/libarchive/libarchive/blob/40ff837717b89e9a5d2c735758f503d124d17b72/libarchive/archive_read_support_format_mtree.c#L1074-L1079

I think isprint here will fail on multibyte sequences, such as characters with a modifier like "ő".