Safer poll timeout #112

Job	Run time
minver	11s
rust_stable	1m 0s
macos	1m 33s
linux_native_builds (x86_64-unknown-linux-gnu)	1m 6s
linux_native_builds (x86_64-unknown-linux-musl)	1m 0s
rustfmt	14s
tier3 (x86_64-unknown-dragonfly)	53s
tier3 (x86_64-unknown-openbsd)	54s
tier3 (armv7-unknown-linux-uclibceabihf)	57s
tier3 (x86_64-unknown-haiku)	49s
redox	34s
cross (arm-unknown-linux-gnueabi)	1m 34s
cross_compiling (aarch64-linux-android)	29s
cross (armv7-unknown-linux-gnueabihf)	1m 31s
cross_compiling (arm-linux-androideabi)	32s
cross (i686-unknown-linux-gnu)	1m 27s
cross_compiling (armv7-linux-androideabi)	34s
cross (i686-unknown-linux-musl)	1m 41s
cross_compiling (i686-linux-android)	32s
cross (mips-unknown-linux-gnu)	1m 35s
cross_compiling (x86_64-linux-android)	30s
cross (mips64-unknown-linux-gnuabi64)	1m 31s
cross_compiling (arm-unknown-linux-musleabi)	33s
cross (mips64el-unknown-linux-gnuabi64)	1m 33s
cross_compiling (x86_64-unknown-fuchsia)	24s
cross (mipsel-unknown-linux-gnu)	1m 28s
cross_compiling (x86_64-unknown-illumos)	24s
cross (powerpc64le-unknown-linux-gnu)	1m 36s
cross_compiling (aarch64-apple-ios, true)	28s
cross_compiling (powerpc64-unknown-linux-gnu)	35s
cross_compiling (s390x-unknown-linux-gnu)	32s
cross_compiling (x86_64-unknown-linux-gnux32)	34s
cross_compiling (x86_64-unknown-netbsd)	25s
	29m 39s

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