Yosys now has their own official scheme for tagging unstable builds;
an automation robot appears from the darkness once every few hours,
bumps the version number, and disappears as silently as they came.
While Nix packages use a date-based version format for unstable
packages, many (most!) users of Yosys use an unstable version. And so
synchronizing the version of the Nix package with the repository version
is significantly less confusing to users. This also adds a safeguard to
ensure others don't forget to bump the version number correctly in the
future.
The testsuite also saw an overhaul (now parallel to help build time), so
some tweaks were needed to get it working again.
Signed-off-by: Austin Seipp <aseipp@pobox.com>
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