Optional package soplex (dependency of scip)

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https://github.com/scipopt/soplex


CC:  @dimpase

Component: **packages: optional**

Author: **Matthias Koeppe**

Branch/Commit: **[`dbff7a0`](https://github.com/sagemath/sagetrac-mirror/commit/dbff7a06c737b71e8fb7eda107dd9d6c9f0cd4b5)**

Reviewer: **Dima Pasechnik**

_Issue created by migration from https://trac.sagemath.org/ticket/34742_

