Prodea Alexandru-Liviu authored Feb 07, 2023 and Eric Engestrom committed Feb 08, 2023

Fixes: 46b099e3
("meson: Ignore unused variables in release builds")

46b099e3 has some issues:
- it doesn't enable unused variables warning on release builds
with assertions enabled;
- it doesn't disable unused variables warning on debug builds
with assertions disabled;
- it doesn't disable unused variables warning when building
with MSVC and assertions are disabled regardless of buildtype,
see #8147. 3/4 regressions reported there have this limitation
alone as root cause.

Reviewed-by: Emma Anholt <emma@anholt.net>
Part-of: <mesa/mesa!21154>
(cherry picked from commit 43470724)