Fix abc_rpc_getinfo when bitcoin-cli is disabled

Summary: get_cli_version requires bitcoin-cli

Test Plan:

cmake -GNinja .. -DBUILD_BITCOIN_CLI=OFF
./test/functional/test_runner.py abc_rpc_getinfo

Reviewers: #bitcoin_abc, PiRK

Reviewed By: #bitcoin_abc, PiRK

Differential Revision: https://reviews.bitcoinabc.org/D17285