Retry poll on EINTR/EAGAIN instead of debug printing #470

Job	Run time
cargo-deny (advisories)	16s
cargo-deny (bans licenses sources)	17s
lint	37s
aarch64-apple-darwin / build	27s
aarch64-apple-darwin-nightly / build	30s
aarch64-apple-ios / build	25s
aarch64-unknown-linux-gnu / build	29s
aarch64-unknown-linux-musl / build	1m 8s
arm-linux-androideabi / build	21s
armv7-linux-androideabi / build	18s
i686-pc-windows-gnu / build	1m 55s
i686-pc-windows-msvc / build	1m 55s
i686-unknown-linux-gnu / build	31s
i686-unknown-linux-musl / build	57s
msrv-aarch64-apple-darwin / build	1m 6s
msrv-arm-linux-androideabi / build	38s
msrv-x86_64-pc-windows-msvc / build	1m 1s
msrv-x86_64-unknown-freebsd / build	47s
msrv-x86_64-unknown-linux-gnu / build	26s
msrv-x86_64-unknown-linux-musl / build	56s
msrv-x86_64-unknown-netbsd / build	51s
x86_64-apple-darwin / build	37s
x86_64-pc-windows-gnu / build	1m 43s
x86_64-pc-windows-msvc / build	1m 58s
x86_64-pc-windows-msvc-nightly / build	1m 12s
x86_64-unknown-freebsd / build	20s
x86_64-unknown-linux-gnu / build	1m 2s
x86_64-unknown-linux-gnu-nightly / build	34s
x86_64-unknown-linux-musl / build	56s
x86_64-unknown-netbsd / build	19s
	24m 32s

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