Meson

ci: only bypass b_lundef if using clang+sanitize (#53) #16

Job	Run time
ubuntu-22.04, default debug	20s
ubuntu-22.04, clang debug	19s
windows-2022, gcc debug	1m 31s
ubuntu-22.04, default release	15s
macos-latest, default debug	21s
windows-2022, default release	41s
macos-latest, default release	27s
windows-2022, default debug	39s
ubuntu-22.04, clang+sanitize debug	19s
windows-2022, clang-cl+sanitize debug	1m 22s
windows-2022, sanitize+asanonly debug	36s
ubuntu-22.04, sanitize debug	18s
windows-2022, gcc release	50s
windows-2022, clang-cl+sanitize release	47s
ubuntu-22.04, clang release	18s
ubuntu-22.04, clang+sanitize release	24s
ubuntu-22.04, sanitize release	36s
windows-2022, sanitize+asanonly release	45s
	10m 48s

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