Fixed #19678 -- GeoDjango test failure with spatialite >= 3.0.

Thanks Julien for the report and Claude for the fix.

django/contrib/gis/tests/test_spatialrefsys.py

@@ -12,7 +12,7 @@ test_srs = ({'srid': 4326,
              # Only the beginning, because there are differences depending on installed libs
              'srtext': 'GEOGCS["WGS 84",DATUM["WGS_1984",SPHEROID["WGS 84"',
              # +ellps=WGS84 has been removed in the 4326 proj string in proj-4.8
-             'proj4_re': r'\+proj=longlat (\+ellps=WGS84 )?\+datum=WGS84 \+no_defs ',
+             'proj4_re': r'\+proj=longlat (\+ellps=WGS84 )?(\+datum=WGS84 |\+towgs84=0,0,0,0,0,0,0 )\+no_defs ',
              'spheroid': 'WGS 84', 'name': 'WGS 84',
              'geographic': True, 'projected': False, 'spatialite': True,
              'ellipsoid': (6378137.0, 6356752.3, 298.257223563),  # From proj's "cs2cs -le" and Wikipedia (semi-minor only)