Spatialite: correctly set proj4text field of spatial_ref_sys when inserting a new SRS in the spatial_ref_sys table (#5174)

git-svn-id: https://svn.osgeo.org/gdal/trunk@26250 f0d54148-0727-0410-94bb-9a71ac55c965
Merge branch 'trunk' into trunk_travis_macosx