Added Socket::set_multicast_if_v4_n to set interface by index (#458) #1394

Job	Run time
Rustfmt	7s
Test (1.70.0)	24s
Test (beta)	22s
Test (stable)	21s
Test (windows)	55s
Clippy	13s
Test (nightly)	22s
check-external-types (ubuntu-latest)	24s
check-external-types (macos-latest)	25s
Test (macos)	21s
check-external-types (windows-latest)	39s
Check (x86_64-unknown-illumos)	35s
Check (i686-linux-android)	36s
Check (x86_64-apple-darwin)	37s
Check (x86_64-apple-ios)	33s
Check (x86_64-unknown-dragonfly)	33s
Check (aarch64-apple-visionos)	35s
Check (aarch64-unknown-redox)	35s
Check (aarch64-linux-android)	34s
Check (aarch64-unknown-openbsd)	32s
Check (x86_64-unknown-linux-musl)	39s
Check (i686-unknown-linux-gnu)	35s
Check (sparcv9-sun-solaris)	32s
Check (x86_64-unknown-redox)	33s
Check (aarch64-unknown-netbsd)	35s
Check (aarch64-unknown-linux-musl)	36s
Check (x86_64-unknown-linux-ohos)	36s
Check (aarch64-apple-tvos)	34s
Check (x86_64-unknown-fuchsia)	36s
Check (x86_64-pc-solaris)	35s
Check (x86_64-unknown-openbsd)	36s
Check (aarch64-unknown-linux-gnu)	32s
Check (aarch64-apple-watchos)	35s
Check (aarch64-apple-darwin)	37s
Check (x86_64-unknown-netbsd)	33s
Check (armv7-linux-androideabi)	35s
Check (x86_64-unknown-linux-gnu)	35s
Check (x86_64-pc-cygwin)	33s
Check (aarch64-unknown-freebsd)	33s
Check (arm-linux-androideabi)	31s
Check (aarch64-unknown-linux-ohos)	37s
Check (arm64_32-apple-watchos)	32s
Check (armv7-unknown-linux-ohos)	37s
Check (x86_64-unknown-freebsd)	35s
Check (aarch64-apple-ios)	32s
Check (x86_64-pc-windows-msvc)	32s
	24m 39s

Provide feedback