Don't set stem.

It shouldn't be necessary, as the stem defaults to the module name and
just needs to be unique and start with the crate name (possibly prefixed
with "lib"), which the module name already does.

This also fixes the handling of variant suffixes, which should apply to
the stem.

Bug: 293289578
Test: Regenerated and build crosvm
Change-Id: Ie3892db933fc36a9e4c461325880f932aed44e53
1 file changed