Add OS related files to gitignore #855

Job	Run time
Build source distributions	10s
Build x86_64 wheels on ubuntu-20.04	46s
Build i686 wheels on ubuntu-20.04	47s
Build manylinux_aarch64 wheels on ubuntu-20.04	1m 4s
Build musllinux_aarch64 wheels on ubuntu-20.04	1m 3s
Build manylinux_ppc64le wheels on ubuntu-20.04	1m 4s
Build musllinux_ppc64le wheels on ubuntu-20.04	1m 3s
Build manylinux_s390x wheels on ubuntu-20.04	1m 1s
Build musllinux_s390x wheels on ubuntu-20.04	1m 2s
Build AMD64 wheels on windows-2019	49s
Build x86 wheels on windows-2019	48s
Build x86_64 universal2 arm64 wheels on macos-11	1m 30s
Check dist	0s
Upload release to PyPI	0s
	11m 7s

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