Fix for rename of conda e-antic package to libeantic

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CC:  @tobiasdiez @saraedum @mkoeppe

Component: **build**

Author: **Isuru Fernando**

Branch/Commit: **[`8a0f319`](https://github.com/sagemath/sagetrac-mirror/commit/8a0f3194d19df7342fc7f7f3558277dbb79bf8d5)**

Reviewer: **Samuel Lelièvre**

_Issue created by migration from https://trac.sagemath.org/ticket/33358_

