rxvt-unicode: Add path to terminfo file.
rxvt-unicode: Add path to terminfo file.

On NixOS, we have set TERMINFO_DIRS to the user environment, so urxvt and curses
programs running within urxvt are able to find the terminfo file. Unfortunately
this isn't the case if you're not using NixOS.

Of course we now no longer need the longDescription, which suggests to issue

export TERMINFO=~/.nix-profile/share/terminfo

... which to my eyes essentially is a workaround. So please correct me when I'm
wrong, but i think it's better if software is working as-is rather than
requiring additional configuration (except if it really makes sense or breaks
purity).

Thanks to Eelis in #nixos for reporting this.

Signed-off-by: aszlig <ee1aa092358634f9c53f01b5a783726c9e21b35a@redmoonstudios.org>

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