BYN: remove write support

Author: rouault

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

@@ -102,7 +102,7 @@ Supported Formats: (ro:read-only, rw:read-write, +:update, v:virtual-I/O s:subda
   KRO -raster- (rw+v): KOLOR Raw (*.kro)
   ROI_PAC -raster- (rw+v): ROI_PAC raster
   RRASTER -raster- (rw+v): R Raster (*.grd)
-  BYN -raster- (rw+v): Natural Resources Canada's Geoid (*.byn, *.err)
+  BYN -raster- (rov): Natural Resources Canada's Geoid (*.byn, *.err)
   NOAA_B -raster- (rov): NOAA GEOCON/NADCON5 .b format (*.b)
   NSIDCbin -raster- (rov): NSIDC Sea Ice Concentrations binary (.bin) (*.bin)
   RIK -raster- (rov): Swedish Grid RIK (.rik) (*.rik)

.github/workflows/windows_conda_expected_gdalinfo_formats.txt

@@ -104,7 +104,7 @@ Supported Formats: (ro:read-only, rw:read-write, +:update, v:virtual-I/O s:subda
   KRO -raster- (rw+v): KOLOR Raw (*.kro)
   ROI_PAC -raster- (rw+v): ROI_PAC raster
   RRASTER -raster- (rw+v): R Raster (*.grd)
-  BYN -raster- (rw+v): Natural Resources Canada's Geoid (*.byn, *.err)
+  BYN -raster- (rov): Natural Resources Canada's Geoid (*.byn, *.err)
   NOAA_B -raster- (rov): NOAA GEOCON/NADCON5 .b format (*.b)
   RIK -raster- (rov): Swedish Grid RIK (.rik) (*.rik)
   USGSDEM -raster- (rwv): USGS Optional ASCII DEM (and CDED) (*.dem)

autotest/gdrivers/byn.py

@@ -34,16 +34,6 @@ def test_byn_1():
 #
 
 
-def test_byn_2():
-
-    tst = gdaltest.GDALTest("BYN", "byn/cgg2013ai08_reduced.byn", 1, 64764)
-    tst.testCreateCopy(new_filename="tmp/byn_test_2.byn")
-
-
-###############################################################################
-#
-
-
 def test_byn_invalid_header_bytes():
 
     tst = gdaltest.GDALTest("BYN", "byn/test_invalid_header_bytes.byn", 1, 64764)