LP1290499: Add PG 9.3 sym link to 9.1 config file

LP1290499: Add PG 9.3 sym link to 9.1 config file

When building the database with Postgres 9.3, the script 'build-db.sh'
requires a file with the following name:

  000.english.pg93.fts-config.sql

This commit adds a symbolic link by that name to the 9.1 config file,
which allows the database to build successfully. This follows the example
of the 9.2 config file, which is already a sym link.

Signed-off-by: Remington Steed <rjs7@calvin.edu>