Subject: bazel-zig-cc v0.8.2

From: Motiejus Jakštys <[email-masked]>
Date: Mon, 4 Jul 2022 15:45:00 +0300

Hi all,

I released v0.8.3, which adds fastbuild, dbg and opt settings with
defaults suitable for zig-cc:

- zig by default adds `-flto`; fastbuild negates it.
- add -O0, which now zig cc[1] interprets correctly.
- also use today's zig sdk for tests.

This v0.8.3 should have been v0.8.1; please ignore v0.8.1 and v0.8.2,
these are caused by me trying to overly rush things today.

[1]: https://github.com/ziglang/zig/issues/11921