I ended up figuring this out on my own - after further research these functions are part of the uuid-ossp extension that the aforementioned postgres_script.sql tries to enable in the line 'CREATE EXTENSION IF NOT EXISTS "uuid-ossp";'  However, this extension already existed in Amazon's RDS instance for Postgres but for some reason I was unable to call the specific uuid_generate_v1mc() function.  In order to refresh/reinstall these functions I ran a 'DROP EXTENSION "uuid-ossp";' and then followed it up with a 'CREATE EXTENSION "uuid-ossp";' 

After doing this, I was able to call the uuid_generate_v1mc() function.  Access to the function can be tested by running 'SELECT uuid_generate_v1mc();'