Try something fancy #962

Job	Run time
test-linux-add_subdirectory (On)	29s
test-linux-add_subdirectory (Off)	25s
test-linux-fetchcontent (On)	32s
test-linux-fetchcontent (Off)	27s
test-linux-findpackage (On)	28s
test-linux-findpackage (Off)	36s
test-macos-add_subdirectory (On)	25s
test-macos-fetchcontent (On)	26s
test-macos-add_subdirectory (Off)	30s
test-macos-findpackage (On)	23s
test-macos-fetchcontent (Off)	36s
test-macos-findpackage (Off)	23s
test-mingw-add_subdirectory (On)	2m 37s
test-mingw-fetchcontent (On)	2m 11s
test-mingw-add_subdirectory (Off)	4m 28s
test-mingw-findpackage (On)	2m 4s
test-mingw-fetchcontent (Off)	1m 55s
test-mingw-findpackage (Off)	1m 24s
test-windows-add_subdirectory (On)	1m 28s
test-windows-fetchcontent (On)	1m 53s
test-windows-findpackage (On)	1m 28s
test-windows-add_subdirectory (Off)	1m 56s
test-windows-fetchcontent (Off)	1m 52s
test-windows-findpackage (Off)	1m 56s
	30m 52s

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