/etc/fonts/conf.d/60-droid-sans-mono-fonts.conf is in fonts-droid 20101110+git-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /etc/fonts/conf.d/../conf.avail/60-droid-sans-mono-fonts.conf
/etc/fonts/conf.d/../conf.avail/60-droid-sans-mono-fonts.conf