Fix handling of the fileno macro #5918

Job	Run time
mingw (mingw64)	4m 20s
mingw (ucrt64)	4m 17s
build (windows-2019, Win32, v142, 17, Debug)	1m 50s
build (windows-2019, Win32, v142, 17, Release)	3m 16s
build (windows-2019, Win32, v142, 17, -DBUILD_SHARED_LIBS=ON, Debug)	2m 16s
build (windows-2019, Win32, v142, 17, -DBUILD_SHARED_LIBS=ON, Release)	2m 36s
build (windows-2019, x64, v140, 14, Debug)	1m 24s
build (windows-2019, x64, v140, 14, Release)	2m 31s
build (windows-2019, x64, v141, 17, Debug)	2m 11s
build (windows-2019, x64, v141, 17, Release)	2m 59s
build (windows-2019, x64, v142, 17, Debug)	2m 8s
build (windows-2019, x64, v142, 17, Release)	3m 30s
build (windows-2019, x64, v142, 17, -DBUILD_SHARED_LIBS=ON, Debug)	1m 9s
build (windows-2019, x64, v142, 17, -DBUILD_SHARED_LIBS=ON, Release)	2m 6s
build (windows-2019, x64, v142, 20, Debug)	1m 28s
build (windows-2019, x64, v142, 20, Release)	3m 7s
build (windows-2022, x64, v143, Debug, 20)	2m 0s
	43m 8s

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