Add connect_unspec #3485

Job	Run time
Check selected Tier 3 platforms (nightly)	7m 37s
Check --no-default-features (nightly)	1m 15s
Check (stable)	11m 30s
Check nightly-only targets (nightly)	36s
Rustfmt	18s
Check (nightly)	9m 53s
Check (1.63)	17m 38s
Test rustix_use_experimental_asm (powerpc64le-linux)	1m 43s
Test (ubuntu)	1m 18s
Test use-libc (ubuntu)	1m 25s
Test (ubuntu-20.04)	1m 21s
Test use-libc (i686-linux)	1m 19s
Test use-libc (aarch64-linux)	2m 9s
Test (i686-linux)	1m 32s
Test (aarch64-linux)	1m 35s
Test use-libc (powerpc64le-linux)	1m 50s
Test (powerpc64le-linux)	1m 33s
Test use-libc (riscv64-linux)	2m 4s
Test use-libc (arm-linux)	1m 40s
Test (riscv64-linux)	1m 26s
Test (s390x-linux)	1m 31s
Test (arm-linux)	1m 31s
Test (ubuntu-stable)	1m 14s
Test (i686-linux-stable)	1m 28s
Test (aarch64-linux-stable)	1m 32s
Test (riscv64-linux-stable)	1m 20s
Test (s390x-linux-stable)	1m 32s
Test (powerpc64le-linux-stable)	1m 32s
Test (arm-linux-stable)	1m 34s
Test (ubuntu-1.63)	1m 30s
Test (i686-linux-1.63)	1m 31s
Test (aarch64-linux-1.63)	1m 34s
Test (riscv64-linux-1.63)	1m 32s
Test (s390x-linux-1.63)	1m 30s
Test (powerpc64le-linux-1.63)	1m 32s
Test (arm-linux-1.63)	1m 34s
Test (macos-latest)	1m 12s
Test (macos-11)	1m 30s
Test (windows)	1m 10s
Test (windows-2019)	1m 16s
	1h 38m 47s

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