Add syslog supports #1572

Job	Run time
linux_native_builds (x86_64-unknown-linux-gnu)	3m 9s
macos	5m 20s
linux_native_builds (x86_64-unknown-linux-musl)	3m 24s
macos-aarch64	2m 43s
minver	12s
rust_stable	1m 25s
rustfmt	7s
tier3 (x86_64-unknown-dragonfly)	1m 6s
tier3 (x86_64-unknown-openbsd)	59s
tier3 (x86_64-unknown-haiku)	57s
tier3 (armv7-unknown-linux-uclibceabihf)	1m 10s
tier3 (i686-unknown-hurd-gnu)	1m 1s
cross	0s
cross_compiling	0s
redox	0s
	21m 33s

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