Keychain 6.0.4 no longer exports the legacy
org.openintents.openpgp.api.OpenPgpService action, so the OpenPgpServiceConnection
from openpgp-api.jar bound nothing and every encrypt/decrypt died with a
NullPointerException in OpenPgpApi.executeApi.
Bind our own ServiceConnection against org.openintents.openpgp.IOpenPgpService
(falling back to the legacy action for older Keychain releases), and queue
API calls until the service is actually connected instead of racing the
async bind.
Also fix the //go:generate recipe: it built one jar containing both
PgpConnect and Permissions, which collides with Permissions.jar when gogio
dexes every *.jar in the repo root.
