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meson: Ignore unused variables when assertions are disabled

Prodea Alexandru-Liviu requested to merge pal1000/mesa:wunused-var-noasserts-fix into main

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 (closed). 3/4 regressions reported there have this limitation alone as root cause.

/cc @jenatali @zmike @dbaker @alyssa @anholt @lygstate @eric @kusma

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