Improve scan #5640

Job	Run time
mingw (mingw64)	4m 7s
build (windows-2019, Win32, v142, 17, Debug)	1m 33s
mingw (ucrt64)	3m 45s
build (windows-2019, Win32, v142, 17, Release)	2m 38s
build (windows-2019, Win32, v142, 17, -DBUILD_SHARED_LIBS=ON, Debug)	1m 36s
build (windows-2019, Win32, v142, 17, -DBUILD_SHARED_LIBS=ON, Release)	2m 10s
build (windows-2019, x64, v140, 14, Debug)	1m 45s
build (windows-2019, x64, v140, 14, Release)	1m 50s
build (windows-2019, x64, v141, 17, Debug)	1m 42s
build (windows-2019, x64, v141, 17, Release)	2m 24s
build (windows-2019, x64, v142, 17, Debug)	1m 25s
build (windows-2019, x64, v142, 17, Release)	2m 6s
build (windows-2019, x64, v142, 17, -DBUILD_SHARED_LIBS=ON, Debug)	1m 32s
build (windows-2019, x64, v142, 17, -DBUILD_SHARED_LIBS=ON, Release)	1m 56s
build (windows-2019, x64, v142, 20, Debug)	1m 40s
build (windows-2019, x64, v142, 20, Release)	2m 32s
build (windows-2022, x64, v143, Debug, 20)	1m 41s
	36m 22s

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