Stellarium / stellarium / 28060799886

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Protect the whole jpl_pleph with the mutex (#5003)

While jpl_state() is not thread-safe, the use of the whole jpl_eph_data
isn't thread-safe either, and it's accessed by jpl_ephem().

Although jpl_ephem() is called from GetDe440Coor, GetDe441Coor, etc.,
these functions aren't used concurrently, so there's no issue with
protecting jpl_ephem() itself by a global JPL mutex.

The jpl_state() itself is only ever used from jpl_ephem(), so it doesn't
really need any additional protection.

Fixes #4993

1 of 1 new or added line in 1 file covered. (100.0%)

14747 of 136061 relevant lines covered (10.84%)

14499.1 hits per line