CI-unixish

selfcheck.sh: added options `VALGRIND_TOOL` and `SIMPLECPP_PATH` / CI-unixish.yml: use `selfcheck.sh` to run valgrind #1149

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Run time

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Job	Run time
build (ubuntu-24.04, g++)	2m 46s
build (ubuntu-24.04, clang++)	2m 38s
	5m 24s