grass_proj: use OSRIsSame to compare CRSs (#6579)

Use newer OSRIsSame() from the OGR SRS API replacing the old G_compare_projections()  in GRASS from PROJ4 times.

Author: metzm

raster/CMakeLists.txt

@@ -220,6 +220,7 @@ build_program_in_subdir(
   grass_gproj
   ${LIBM}
   PRIMARY_DEPENDS
+  PROJ::proj
   GDAL::GDAL)
 
 build_program_in_subdir(r.external.out DEPENDS grass_gis grass_raster grass_gproj
@@ -271,6 +272,7 @@ build_program_in_subdir(
   grass_imagery
   ${LIBM}
   PRIMARY_DEPENDS
+  PROJ::proj
   GDAL::GDAL)
 
 build_program_in_subdir(r.in.gridatb DEPENDS grass_gis grass_raster)

raster/r.external/Makefile

@@ -2,7 +2,7 @@ MODULE_TOPDIR = ../..
 
 PGM  = r.external
 
-LIBES = $(GPROJLIB) $(RASTERLIB) $(GISLIB) $(GDALLIBS) $(MATHLIB) $(IMAGERYLIB)
+LIBES = $(GPROJLIB) $(RASTERLIB) $(GISLIB) $(GDALLIBS) $(MATHLIB) $(IMAGERYLIB) $(PROJLIB)
 DEPENDENCIES = $(GPROJDEP) $(RASTERDEP) $(GISDEP) $(IMAGERYDEP)
 EXTRA_INC = $(PROJINC) $(GDALCFLAGS)