EPSG:54009 not in spatial_ref_sys

[komzpa]

GHSL popluation raster is distributed this way.

insert into
  spatial_ref_sys (srid, auth_name, auth_srid, proj4text, srtext)
values
(54009, 'ESRI', 54009, '+proj=moll +lon_0=0 +x_0=0 +y_0=0 +datum=WGS84 +units=m +no_defs',
 'PROJCS["World_Mollweide",GEOGCS["GCS_WGS_1984",DATUM["WGS_1984",SPHEROID["WGS_1984",6378137,298.257223563]],PRIMEM["Greenwich",0],UNIT["Degree",0.017453292519943295]],PROJECTION["Mollweide"],PARAMETER["False_Easting",0],PARAMETER["False_Northing",0],PARAMETER["Central_Meridian",0],UNIT["Meter",1],AUTHORITY["EPSG","54009"]]');

[Algunenano]

Should we consider updating spatial_ref_sys?

[komzpa]

Patch: ​https://github.com/postgis/postgis/pull/437

[pramsey]

In 17592:

Add new entries to spatial_ref_sys and handle non-EPSG authnames
Closes #4417