Use Monospace in urxvt, Monospace/Consolas in Vim

The configuration for rxvt-unicode uses Bitstream Vera Sans Mono
which maps to DejaVu Sans Mono on my Debian system, and so does
Monospace.

    susam@nifty:~$ fc-match "Bitstream Vera Sans Mono"
    DejaVuSansMono.ttf: "DejaVu Sans Mono" "Book"
    susam@nifty:~$ fc-match "Monospace"
    DejaVuSansMono.ttf: "DejaVu Sans Mono" "Book"

Choose Monospace for rxvt-unicode.

For Vim, choose the font based on the GUI environment. If GTK+ 2
GUI is available, then use Monospace. If MS Windows Win32 GUI is
available, then use Consolas.