rxvt-unicode termcap entry

[Nikita Ronja Gillmann <nikita%klang.is@localhost>]

Is there any particular reason why we do not provide a termcap/terminfo
entry for rxvt-unicode and others in the base system?
I found that FreeBSD has it since around last year.

Updating my own database lead to non-functional terminals (appending the
file rxvt-unicode ships to the end of terminfo, then tic that to
generate a new database).