databases/evolution-data-server: Only one webkit.

Cleanup dependencies from 284965.

Add BDB and GTK4 options from 284965.

Add CANBERRA and OAUTH2 options.

Depend on at-most one flavor of webkit, selected by GTK4 option.
Webkit is not needed when OAUTH2 is disabled.

PR: 284965, 288105
Reviewed by: fluffy