[CI] Build gandiva in cpp docker image

[asfimport]

Currently Gandiva is not built, for the sake of completeness enable it by default.

Reporter: Krisztian Szucs / @kszucs
Assignee: Uwe Korn / @xhochy

Related issues:

• [C++/Docker] Build Gandiva in the docker containers (duplicates)

_{Note: This issue was originally created as ARROW-4416. Please see the migration documentation for further details.}

[asfimport]

Uwe Korn / @xhochy:
Already taking care of this in #3688