configure.ac: move all protocol requirements to a single location.
Protocol requirements were spread throughout configure.ac, leaving us with a few locations where one DDX asked for a different version of the package than another. For each protocol, define <NAME>PROTO="[<name>proto >= version]" and assemble REQUIRED_MODULES based on these. Future changes to protocol versions need to only be done in a single place. Signed-off-by: Peter Hutterer <email@example.com>
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