X-Debbugs-CC: slg <0x2d@disroot.org>

Hi guix,

These two patches fix <https://issues.guix.gnu.org/49530>.
The dependencies of python-pycryptodome (found with "guix refresh -l")
still build succesfully.

I performed the unbundling in build phases as I'm not sure
what is the proper way to use 'tar' from a snippet, and whether
the unbundling is done in a build phase or an 'origin' snippet
doesn't seem to matter much, as the bundled code is free software.

Greetings,
Maxime.