Comment 15 for bug 1790855

I further found potential changes that need adaptations in:
- Savannah issue #53671: policy_t -> gps_policy_t. [7]
- ATT: centralize clearing of the attitude data. [8]

[7]: https://git.savannah.gnu.org/cgit/gpsd.git/commit/?id=25edf0e836200ee4f6cf86fa4456635ee210484f
[8]: https://git.savannah.gnu.org/cgit/gpsd.git/commit/?id=a7dc77f0c6730f97e5dfbaefa70bfa3730caaeff

[7] might only need a rename if the name is used externally, [8] seems to be a nop for consuming code unless you want to use the new gps_clear_att.

I'm stopping this preevaluation for now, until I find time to really look at all the rev-deps using GPS and trying to fix them.