[GRASS-git] [OSGeo/grass] d3c647: configure: require PROJ version 9.0 (#6693)

[Nicklas Larsson]

  Branch: refs/heads/main
  Home:   https://github.com/OSGeo/grass
  Commit: d3c6479bef77a58e3b5d85259303dbfb9c1babe8
      https://github.com/OSGeo/grass/commit/d3c6479bef77a58e3b5d85259303dbfb9c1babe8
  Author: Nicklas Larsson <n_larsson at yahoo.com>
  Date:   2025-12-08 (Mon, 08 Dec 2025)

  Changed paths:
    M REQUIREMENTS.md
    M cmake/modules/CheckDependentLibraries.cmake
    M configure
    M configure.ac
    M display/d.grid/plot.c
    M display/d.where/main.c
    M general/g.proj/input.c
    M general/g.proj/list_codes.c
    M general/g.proj/output.c
    M general/g.region/printwindow.c
    M general/g.version/main.c
    M include/config.h.cmake.in
    M include/grass/config.h.in
    M include/grass/defs/gprojects.h
    M include/grass/gprojects.h
    M lib/proj/convert.c
    M lib/proj/do_proj.c
    M lib/proj/get_proj.c
    M raster/r.external/proj.c
    M raster/r.in.gdal/proj.c
    M raster/r.out.gdal/main.c
    M raster/r.proj/main.c
    M raster3d/r3.out.netcdf/main.c
    M vector/v.external/proj.c
    M vector/v.in.ogr/proj.c
    M vector/v.out.ogr/main.c
    M vector/v.proj/main.c

  Log Message:
  -----------
  configure: require PROJ version 9.0 (#6693)

Drop support for PROJ's old `proj_api.h` API and make the
version 9.0 the minimal requirement of PROJ support.

In addition, remove code using the proj_api.h API.



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