[Toybox] more tar madness

[enh]

continuing to be a moving target...

the kernel folks are about to start using tar --wildcards, which i also
hadn't heard of. (
https://android-review.googlesource.com/c/kernel/build/+/2241508/7..9/kleaf/impl/abi/extracted_symbols.bzl#73
)

sounds like that might be a no-op though, asking for the default behavior?

       --wildcards
              Use wildcards (default for exclusion).

also, allegedly (by which i only mean "i haven't confirmed myself") that
new use of --xform gets you a "bad xform" with toybox tar...

tar --directory={intermediates_dir} --wildcards --xform='s#^.+/##x' -xf
{base_modules_archive} '*.ko'
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