Run internal tests in Cygwin #3157

Job	Run time
macos-static	2m 42s
windows-mingw-build (32)	57s
windows (32, windows-2019)	6m 9s
windows-mingw-build (64)	58s
windows (32, windows-2022)	6m 2s
windows (64, windows-2019)	4m 58s
cygwin (32)	2m 56s
unix (ubuntu-20.04, g++, make)	6m 2s
cygwin (64)	3m 2s
unix (ubuntu-20.04, g++, cmake)	6m 2s
unix (ubuntu-20.04, clang++, make)	6m 19s
windows (64, windows-2022)	6m 3s
unix (ubuntu-20.04, clang++, cmake)	6m 7s
unix (ubuntu-22.04, g++, make)	6m 3s
unix (ubuntu-22.04, g++, cmake)	6m 17s
unix (ubuntu-22.04, clang++, make)	4m 17s
unix (ubuntu-22.04, clang++, cmake)	4m 25s
unix (macos-14, clang++, make)	6m 15s
unix (macos-14, clang++, cmake)	6m 23s
windows-mingw-testing (windows-2019, 32)	3m 46s
windows-mingw-testing (windows-2019, 64)	4m 13s
windows-mingw-testing (windows-2022, 32)	4m 21s
windows-mingw-testing (windows-2022, 64)	4m 19s
	1h 48m 36s

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