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As reading the Trac ticket you link to suggests,

This file is no longer used since #9343.

That ticket indicates that there is a different function in Pari/GP that performs some of this - perhaps ellap. According to the Pari official website,

(OBSOLETE). The 'ellsea' package, an implementation of the Schoof-Elkies-Atkin algorithm over a prime field, by Christophe Doche and Sylvain Duquesne. The functionality is now available natively in pari-2.5, using the seadata official package.

I hope this helps.