test-yacas: Use simply `bash` instead of `/bin/bash`

grzegorzmazur / yacas

Computer calculations made easy

http://www.yacas.org

GNU Lesser General Public License v2.1

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Closed doronbehar closed 2 years ago

doronbehar commented 2 years ago

It's not always available, for example in systems such as NixOS (#339).

Fixes #339.