libraster: add support for GDAL 2.3 on Windows

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@73574 15284696-431f-4ddb-bdfa-cd5b030d7da7

lib/raster/gdal.c

@@ -115,6 +115,7 @@ static void load_library(void)
 	"libgdal1.7.0.so",
 # endif
 # ifdef _WIN32
+	"gdal203.dll",        
 	"gdal202.dll",        
 	"gdal201.dll",
 	"gdal200.dll",