Fix bitcoin-cli --version

Summary:
By declaring the relevant option.

Note contrib/devtools/gen-manpages.sh relies on this version information.

This is a backport of Core PR13725

Test Plan:

make check
./test/functional/test_runner.py

Reviewers: #bitcoin_abc, Fabien

Reviewed By: #bitcoin_abc, Fabien

Subscribers: Fabien

Differential Revision: https://reviews.bitcoinabc.org/D3728