Fix coding style in rtp module.

* Named callback types only.
* No anonymous enums or structs.
* `++i` instead of `i++`.
* Don't use enums to specify integer constants. Enums should be
  enumerations. All values of an enum type should be listed[1].

[1] I don't know what to do about bit masks yet, but given that enums by
C standard can only go up to 32767 portably and 2^31 in reality, they are
probably not useful for 64 bit bit masks.

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