/etc/fonts/conf.d/11-lcdfilter-default.conf is in fontconfig-config 2.11.0-6.3+deb8u1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/fontconfig/conf.avail/11-lcdfilter-default.conf
/usr/share/fontconfig/conf.avail/11-lcdfilter-default.conf