bug#49083: ‘guix import pypi’ fails in the absence of “sdist” releases

[Ludovic Courtès]

Hi!

So for now I “fixed” it by displaying a hint in commit
00762a4c4c8ecdd71cccf6afdd87ae68bf9b4964.

--8<---------------cut here---------------start------------->8---
$ ./pre-inst-env guix import pypi jaxlib
guix import: error: no source release for pypi package jaxlib 0.1.76

hint: This indicates that the package is available on PyPI, but only as a 
"wheel" containing
binaries, not source.  To build it from source, refer to the upstream 
repository at
`https://github.com/google/jax'.
--8<---------------cut here---------------end--------------->8---

Ludo’.