[PostGIS] #5915: ST_LineLocatePoint returns incorrect result with Geography input and use_spheroid = false

[PostGIS]

#5915: ST_LineLocatePoint returns incorrect result with Geography input and
use_spheroid = false
--------------------------------+---------------------------
 Reporter:  dmyzl               |      Owner:  pramsey
     Type:  defect              |     Status:  new
 Priority:  medium              |  Milestone:  PostGIS 3.5.4
Component:  postgis             |    Version:  3.5.x
 Keywords:  ST_LineLocatePoint  |
--------------------------------+---------------------------
 When passing Geography to `ST_LineLocatePoint`, and setting the third
 parameter to use a standard sphere (`use_spheroid = false`), the function
 returns an incorrect result:

 {{{
 select ST_LineLocatePoint(ST_GeogFromText('linestring(0 5,0 1,0 -3,0
 -5)'), ST_GeogFromText('point(5 0)'), true);
 -- return: 0.5

 select ST_LineLocatePoint(ST_GeogFromText('linestring(0 5,0 1,0 -3,0
 -5)'), ST_GeogFromText('point(5 0)'), false);
 -- return: 0
 }}}

 postgis_full_version:

 {{{
 POSTGIS="3.5.3 0" [EXTENSION] PGSQL="170" GEOS="3.13.1-CAPI-1.19.2"
 SFCGAL="SFCGAL 1.5.0, CGAL 5.6, BOOST 1.74.0" PROJ="9.3.1
 NETWORK_ENABLED=OFF URL_ENDPOINT=https://cdn.proj.org
 USER_WRITABLE_DIRECTORY=/home/yzl/.local/share/proj
 DATABASE_PATH=/home/yzl/project/build_pg_postgis/proj-9.3.1/tmp_install/share/proj/proj.db"
 (compiled against PROJ 9.3.1) GDAL="GDAL 3.7.2, released 2023/09/05"
 LIBXML="2.9.13" LIBJSON="0.17" LIBPROTOBUF="1.3.3" WAGYU="0.5.0
 (Internal)" (core procs from "3.5.2 dea6d0a" need upgrade) TOPOLOGY
 (topology procs from "3.5.2 dea6d0a" need upgrade) RASTER (raster procs
 from "3.5.2 dea6d0a" need upgrade) (sfcgal procs from "3.5.2 dea6d0a" need
 upgrade)
 }}}
-- 
Ticket URL: <https://trac.osgeo.org/postgis/ticket/5915>
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