refactor recvmmsg lifetimes #1835

Job	Run time
macos	42s
aarch64_linux_native_builds (aarch64-unknown-linux-gnu)	6h 0m 14s
aarch64_linux_native_builds (aarch64-unknown-linux-musl)	6h 0m 13s
macos-aarch64	27s
minver	15s
rust_stable	6h 0m 13s
rustfmt	8s
solaris (x86_64-pc-solaris)	3m 8s
tier3 (x86_64-unknown-dragonfly)	32s
tier3 (x86_64-unknown-openbsd)	33s
x86_64_linux_native_builds (x86_64-unknown-linux-gnu)	6h 0m 13s
tier3 (x86_64-unknown-haiku)	36s
x86_64_linux_native_builds (x86_64-unknown-linux-musl)	6h 0m 13s
tier3 (armv7-unknown-linux-uclibceabihf)	1m 8s
tier3 (i686-unknown-hurd-gnu)	33s
cross_compiling	0s
cross	0s
redox	0s
	1d 6h 9m 8s

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