Making `solana_vote_program` is not an option because
then vote_program's entrypoint conflicts with reward_program's
entrypoint.
This unfortunately turns the SDK into a dumping ground for all
things shared between vote_program and other programs. Better
would be to create a solana-vote-api crate similar to the
solana-rewards-api crate.
Now clients can use all the libraries to create transactions
and disect account data without needing to be constrained about
what can be compiled into a shared object or BPF.
Likewise, program development can move forward without being
concerned with bloating the shared object.
Greg Fitzgerald