sys::socket adding GetOnly `TCP_FUNCTION_ALIAS` for freebsd. #1659

Job	Run time
rust_stable	1m 26s
linux_native_builds (x86_64-unknown-linux-gnu)	2m 21s
macos	3m 27s
linux_native_builds (x86_64-unknown-linux-musl)	2m 11s
macos-aarch64	1m 44s
minver	14s
rustfmt	4s
solaris (x86_64-pc-solaris)	4m 30s
tier3 (x86_64-unknown-dragonfly)	1m 4s
tier3 (x86_64-unknown-openbsd)	1m 4s
tier3 (x86_64-unknown-haiku)	1m 0s
tier3 (armv7-unknown-linux-uclibceabihf)	1m 12s
redox	39s
cross (arm-unknown-linux-gnueabi)	1m 51s
cross_compiling (aarch64-linux-android)	38s
cross (armv7-unknown-linux-gnueabihf)	1m 51s
cross_compiling (arm-linux-androideabi)	41s
cross (i686-unknown-linux-gnu)	1m 47s
cross_compiling (armv7-linux-androideabi)	42s
cross (i686-unknown-linux-musl)	1m 50s
cross_compiling (i686-linux-android)	37s
cross (mips-unknown-linux-gnu)	2m 13s
cross_compiling (x86_64-linux-android)	35s
cross (mips64-unknown-linux-gnuabi64)	1m 55s
cross_compiling (arm-unknown-linux-musleabi)	45s
cross (mips64el-unknown-linux-gnuabi64)	1m 52s
cross_compiling (x86_64-unknown-fuchsia)	31s
cross (mipsel-unknown-linux-gnu)	1m 48s
cross_compiling (x86_64-unknown-illumos)	29s
cross (powerpc64le-unknown-linux-gnu)	1m 50s
cross_compiling (aarch64-apple-ios, true)	32s
cross (loongarch64-unknown-linux-gnu)	1m 56s
cross_compiling (powerpc64-unknown-linux-gnu)	42s
cross_compiling (s390x-unknown-linux-gnu)	43s
cross_compiling (x86_64-unknown-linux-gnux32)	41s
cross_compiling (x86_64-unknown-netbsd)	36s
	48m 1s

Provide feedback