CI-mingw

CI-unixish.yml: added callgrind runs with `-O3` and LTO #193

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Run time

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Job	Run time
build (g++, MINGW64)	4m 11s
build (clang++, MINGW64)	3m 10s
build (clang++, CLANG64)	3m 42s
build (g++, MINGW32)	3m 49s
	14m 52s