Remove SGI driver

Author: rouault

.github/workflows/ubuntu_24.04/expected_gdalinfo_formats.txt

@@ -40,7 +40,6 @@ Supported Formats: (ro:read-only, rw:read-write, +:update, v:virtual-I/O s:subda
   PCIDSK -raster,vector- (rw+v): PCIDSK Database File (*.pix)
   PCRaster -raster- (rw+): PCRaster Raster File (*.map)
   ILWIS -raster- (rw+v): ILWIS Raster Map (*.mpr, *.mpl)
-  SGI -raster- (rw+v): SGI Image File Format 1.0 (*.rgb)
   SRTMHGT -raster- (rwv): SRTMHGT File Format (*.hgt)
   Leveller -raster- (rw+v): Leveller heightfield (*.ter)
   Terragen -raster- (rw+v): Terragen heightfield (*.ter)

.github/workflows/windows_conda_expected_gdalinfo_formats.txt

@@ -40,7 +40,6 @@ Supported Formats: (ro:read-only, rw:read-write, +:update, v:virtual-I/O s:subda
   PCIDSK -raster,vector- (rw+v): PCIDSK Database File (*.pix)
   PCRaster -raster- (rw+): PCRaster Raster File (*.map)
   ILWIS -raster- (rw+v): ILWIS Raster Map (*.mpr, *.mpl)
-  SGI -raster- (rw+v): SGI Image File Format 1.0 (*.rgb)
   SRTMHGT -raster- (rwv): SRTMHGT File Format (*.hgt)
   Leveller -raster- (rw+v): Leveller heightfield (*.ter)
   Terragen -raster- (rw+v): Terragen heightfield (*.ter)

autotest/gdrivers/data/sgi/byte.sgi

@@ -162,7 +162,6 @@ Raster drivers
    sdat
    sdts
    sentinel2
-   sgi
    sigdem
    snap_tiff
    snodas

autotest/gdrivers/sgi.py

@@ -98,7 +98,6 @@ gdal_optional_format(rs2 "RS2 -- RadarSat 2 XML Product")
 gdal_optional_format(ilwis "Raster Map")
 gdal_optional_format(rmf "RMF --- Raster Matrix Format")
 gdal_optional_format(leveller "Daylon Leveller heightfield")
-gdal_optional_format(sgi "SGI Image driver")
 gdal_optional_format(srtmhgt "SRTM HGT File Read Support")
 gdal_optional_format(idrisi "Idrisi Raster Format")
 gdal_optional_format(gsg "Implements the Golden Software Surfer 7 Binary Grid Format.")

doc/source/drivers/raster/index.rst

@@ -55,7 +55,6 @@ SAFE
 PCIDSK
 PCRaster
 ILWIS
-SGI
 SRTMHGT
 Leveller
 Terragen

doc/source/drivers/raster/sgi.rst

@@ -466,10 +466,6 @@ void CPL_STDCALL GDALAllRegister()
     GDALRegister_ILWIS();
 #endif
 
-#ifdef FRMT_sgi
-    GDALRegister_SGI();
-#endif
-
 #ifdef FRMT_srtmhgt
     GDALRegister_SRTMHGT();
 #endif