pseudo: Add lchmod wrapper

New versions of glibc have an lchmod function so we need to wrap it.

Identified through a reproducibility issue in initramfs-base where
/dev/console created by mknod from coreutils changed permissions
depending on the host distro (mknod used the gnulib wrapper on most
hosts but newer ones used the libc call).

[YOCTO #14162]

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit 20a64566)
Signed-off-by: Steve Sakoman <steve@sakoman.com>