convert CI CompilerWarnings job to meson

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1 patchset tracked - current t253925_1

v1t253925_1posted Sep 24, 15:11no CIwon't retryrecent 28dpg 20
base89829354d Sep 24, 11:41 on master
applyapplied Sep 24, 15:13
rebaselast tried Sep 24, 15:13 on 89829354d
skippedpatchset touches .github/