Add RedoxOS Epoll #813

Job	Run time
clippy	14s
fmt	13s
cross (ubuntu-latest)	1m 35s
msrv (ubuntu-latest)	1m 14s
cross (macos-latest)	33s
msrv (windows-latest)	1m 42s
security_audit	7s
test (ubuntu-latest, nightly)	55s
wine	1m 33s
test (ubuntu-latest, beta)	55s
test (ubuntu-latest, stable)	53s
test (windows-latest, nightly)	2m 16s
test (windows-latest, beta)	2m 0s
test (windows-latest, stable)	2m 8s
test (macos-latest, nightly)	1m 31s
test (macos-latest, beta)	1m 39s
test (macos-latest, stable)	1m 24s
test (windows-latest, nightly-x86_64-pc-windows-gnu)	2m 20s
test (windows-latest, nightly-i686-pc-windows-msvc)	2m 15s
test (windows-latest, nightly-i686-pc-windows-gnu)	2m 24s
	27m 51s

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