fix a little line-ending bug in readFile #1209

Job	Run time
canceller	7s
tests-Unix-GUI (ubuntu-20.04, 5.9.5, 7)	4m 54s
tests-Windows-CLI (mingw64, x86_64, 3.8)	21m 38s
tests-Unix-GUI (ubuntu-20.04, 5.15.2, 11)	8m 32s
tests-Unix-CLI (ubuntu-20.04, 7, 3.8)	11m 45s
tests-Windows-CLI (ucrt64, ucrt-x86_64, 3.8)	22m 53s
tests-Unix-GUI (ubuntu-22.04, 5.15.2, 12)	6m 17s
tests-Windows-GUI (mingw64, x86_64)	12m 26s
tests-Unix-CLI (ubuntu-20.04, 11, 3.9)	13m 5s
tests-Windows-GUI (ucrt64, ucrt-x86_64)	12m 23s
tests-Unix-GUI (ubuntu-22.04, 6.7.2, 12)	7m 5s
tests-Unix-CLI (macos-12, 3.8)	18m 33s
tests-windows-latest-pacman (mingw64, x86_64)	1m 49s
tests-Unix-GUI (macos-12, 5.9.5)	8m 53s
tests-Unix-CLI (macos-13, 3.9)	16m 53s
tests-windows-latest-pacman (ucrt64, ucrt-x86_64)	1m 41s
tests-Unix-GUI (macos-13, 5.15.2)	10m 25s
tests-Unix-GUI (macos-13, 6.7.2)	13m 40s
	3h 12m 59s

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