Exclude NUL characters from OSStrings returned by getsockopt #1655

Job	Run time
macos	2m 50s
macos-aarch64	1m 31s
minver	14s
linux_native_builds (x86_64-unknown-linux-gnu)	2m 21s
linux_native_builds (x86_64-unknown-linux-musl)	2m 11s
rust_stable	1m 37s
rustfmt	7s
solaris (x86_64-pc-solaris)	4m 5s
tier3 (x86_64-unknown-dragonfly)	1m 2s
tier3 (x86_64-unknown-openbsd)	1m 4s
tier3 (x86_64-unknown-haiku)	1m 1s
tier3 (armv7-unknown-linux-uclibceabihf)	1m 12s
redox	42s
cross_compiling (aarch64-linux-android)	39s
cross_compiling (arm-linux-androideabi)	36s
cross (arm-unknown-linux-gnueabi)	1m 47s
cross_compiling (armv7-linux-androideabi)	35s
cross (armv7-unknown-linux-gnueabihf)	1m 48s
cross_compiling (i686-linux-android)	35s
cross (i686-unknown-linux-gnu)	1m 49s
cross_compiling (x86_64-linux-android)	35s
cross (i686-unknown-linux-musl)	1m 59s
cross_compiling (arm-unknown-linux-musleabi)	41s
cross (mips-unknown-linux-gnu)	1m 48s
cross_compiling (x86_64-unknown-fuchsia)	32s
cross (mips64-unknown-linux-gnuabi64)	1m 48s
cross_compiling (x86_64-unknown-illumos)	32s
cross (mips64el-unknown-linux-gnuabi64)	1m 53s
cross_compiling (aarch64-apple-ios, true)	31s
cross (mipsel-unknown-linux-gnu)	1m 56s
cross_compiling (powerpc64-unknown-linux-gnu)	43s
cross (powerpc64le-unknown-linux-gnu)	2m 0s
cross_compiling (s390x-unknown-linux-gnu)	41s
cross (loongarch64-unknown-linux-gnu)	1m 50s
cross_compiling (x86_64-unknown-linux-gnux32)	41s
cross_compiling (x86_64-unknown-netbsd)	32s
	46m 28s

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