fixup! Fix flushing C++ iostreams before calling write_console() #40

Job	Run time
mingw (mingw64)	6m 34s
mingw (ucrt64)	6m 2s
build (windows-2019, Win32, v142, 17, Debug)	2m 27s
build (windows-2019, Win32, v142, 17, Release)	3m 31s
build (windows-2019, Win32, v142, 17, -DBUILD_SHARED_LIBS=ON, Debug)	2m 21s
build (windows-2019, Win32, v142, 17, -DBUILD_SHARED_LIBS=ON, Release)	3m 15s
build (windows-2019, x64, v140, 14, Debug)	3m 48s
build (windows-2019, x64, v140, 14, Release)	3m 13s
build (windows-2019, x64, v141, 17, Debug)	2m 4s
build (windows-2019, x64, v141, 17, Release)	4m 25s
build (windows-2019, x64, v142, 17, Debug)	2m 54s
build (windows-2019, x64, v142, 17, Release)	3m 55s
build (windows-2019, x64, v142, 17, -DBUILD_SHARED_LIBS=ON, Debug)	2m 25s
build (windows-2019, x64, v142, 17, -DBUILD_SHARED_LIBS=ON, Release)	3m 55s
build (windows-2019, x64, v142, 20, Debug)	3m 9s
build (windows-2019, x64, v142, 20, Release)	5m 15s
build (windows-2022, x64, v143, Debug, 20)	2m 56s
	1h 2m 9s

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