ul(1): Sync with FreeBSD (mainly for multibyte char support).
rev(1): Add multibyte char support.

Taken-from: FreeBSD
paste(1): Sync with FreeBSD (mainly for multibyte char support).

While here, also mention the affecting environment variables in the
manual page.
pkill.1: Re-adjust the manual page a bit.
Bring in FreeBSD's perror(1) utility.
kernel/vmx: Fix typo in a message.