Fix: header_included_v6 is broken on BSD OSes #1111

Job	Run time
Rustfmt	4s
Test (stable)	14s
Check (aarch64-apple-darwin)	36s
Test (1.63.0)	1m 18s
Clippy	14s
Check (aarch64-apple-ios)	29s
Test (beta)	19s
Check (aarch64-apple-tvos)	31s
Test (nightly)	22s
Check (aarch64-apple-visionos)	33s
Check (aarch64-apple-watchos)	28s
Check (aarch64-linux-android)	30s
Check (aarch64-unknown-freebsd)	30s
Test (macos)	22s
Check (aarch64-unknown-linux-gnu)	32s
Test (windows)	49s
Check (aarch64-unknown-linux-musl)	29s
Check (aarch64-unknown-netbsd)	31s
Check (aarch64-unknown-openbsd)	36s
Check (aarch64-unknown-redox)	31s
Check (arm-linux-androideabi)	29s
Check (arm64_32-apple-watchos)	29s
Check (armv7-linux-androideabi)	30s
Check (armv7-sony-vita-newlibeabihf)	27s
Check (i686-linux-android)	28s
Check (i686-unknown-hurd-gnu)	29s
Check (i686-unknown-linux-gnu)	29s
Check (sparcv9-sun-solaris)	27s
Check (x86_64-apple-darwin)	29s
Check (x86_64-apple-ios)	33s
Check (x86_64-pc-solaris)	29s
Check (x86_64-pc-windows-msvc)	28s
Check (x86_64-unknown-dragonfly)	34s
Check (x86_64-unknown-freebsd)	29s
Check (x86_64-unknown-fuchsia)	29s
Check (x86_64-unknown-illumos)	29s
Check (x86_64-unknown-linux-gnu)	35s
Check (x86_64-unknown-linux-musl)	34s
Check (x86_64-unknown-netbsd)	28s
Check (x86_64-unknown-openbsd)	30s
Check (x86_64-unknown-redox)	32s
	20m 25s

Provide feedback