Rename `RecvMsgReturn` to `RecvMsg`. (#1296) #4751

Job	Run time
Rustfmt	14s
Check nightly-only targets (nightly)	19s
Check (stable)	6m 17s
Check --no-default-features (nightly)	54s
Check (nightly)	6m 14s
Check (1.63)	11m 8s
Check selected Tier 3 platforms (nightly)	5m 33s
Test rustix_use_experimental_asm (powerpc64le-linux)	1m 14s
Test rustix_use_experimental_asm (s390x-linux)	1m 21s
Test (ubuntu)	43s
Test (ubuntu-20.04)	41s
Test (i686-linux)	1m 5s
Test (aarch64-linux)	1m 19s
Test use-libc (ubuntu)	47s
Test (powerpc64le-linux)	2m 38s
Test use-libc (i686-linux)	1m 8s
Test (riscv64-linux)	1m 15s
Test use-libc (aarch64-linux)	1m 19s
Test (s390x-linux)	1m 29s
Test (arm-linux)	1m 9s
Test use-libc (powerpc64le-linux)	1m 20s
Test (ubuntu-stable)	45s
Test use-libc (riscv64-linux)	2m 5s
Test (i686-linux-stable)	1m 18s
Test use-libc (s390x-linux)	1m 19s
Test (aarch64-linux-stable)	1m 10s
Test use-libc (arm-linux)	1m 13s
Test (riscv64-linux-stable)	1m 15s
Test (s390x-linux-stable)	1m 17s
Test (powerpc64le-linux-stable)	1m 15s
Test (arm-linux-stable)	1m 18s
Test (ubuntu-1.63)	2m 40s
Test (i686-linux-1.63)	3m 8s
Test (aarch64-linux-1.63)	3m 10s
Test (riscv64-linux-1.63)	3m 19s
Test (s390x-linux-1.63)	3m 22s
Test (powerpc64le-linux-1.63)	3m 10s
Test (arm-linux-1.63)	3m 12s
Test (macos-latest)	42s
Test (macos-13)	1m 2s
Test (windows)	42s
Test (windows-2019)	55s
Test (musl)	47s
	1h 27m 11s

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