Parse SOL_TLS control message, closes #2064 (#2065) #19

Job	Run time
rust_stable	54s
minver	16s
macos	1m 25s
linux_native_builds (x86_64-unknown-linux-gnu)	1m 5s
linux_native_builds (x86_64-unknown-linux-musl)	1m 44s
rustfmt	8s
tier3 (x86_64-unknown-dragonfly)	1m 19s
tier3 (x86_64-unknown-openbsd)	51s
tier3 (armv7-unknown-linux-uclibceabihf)	1m 21s
tier3 (x86_64-unknown-haiku)	1m 6s
redox	30s
cross (arm-unknown-linux-gnueabi)	1m 37s
cross_compiling (aarch64-linux-android)	43s
cross (armv7-unknown-linux-gnueabihf)	1m 28s
cross_compiling (arm-linux-androideabi)	30s
cross (i686-unknown-linux-gnu)	2m 8s
cross_compiling (armv7-linux-androideabi)	38s
cross (i686-unknown-linux-musl)	2m 44s
cross_compiling (i686-linux-android)	34s
cross (mips-unknown-linux-gnu)	6m 54s
cross_compiling (x86_64-linux-android)	29s
cross (mips64-unknown-linux-gnuabi64)	1m 34s
cross_compiling (arm-unknown-linux-musleabi)	34s
cross (mips64el-unknown-linux-gnuabi64)	1m 34s
cross_compiling (x86_64-unknown-fuchsia)	25s
cross (mipsel-unknown-linux-gnu)	2m 10s
cross_compiling (x86_64-unknown-illumos)	39s
cross (powerpc64le-unknown-linux-gnu)	1m 31s
cross_compiling (aarch64-apple-ios, true)	43s
cross_compiling (powerpc64-unknown-linux-gnu)	55s
cross_compiling (s390x-unknown-linux-gnu)	59s
cross_compiling (x86_64-unknown-linux-gnux32)	34s
cross_compiling (x86_64-unknown-netbsd)	24s
	40m 26s

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