Log Message:
Update to 4.9.2.

Note that the PVALUE rename is not an ABI change and there is no revbump.

4.9.2 Release Notes
-------------------

 o proj_def.dat was missing from source distribution
   see https://github.com/OSGeo/proj.4/issues/274 for more detail

 o Update Geodesic library from GeographicLib

 o Remove setlocale() use in pj_init_ctx()

 o Renamed PVALUE in pj_param.c to prevent clash with Windows