Extend list of candidate filenames for GDAL DLL

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@40758 15284696-431f-4ddb-bdfa-cd5b030d7da7

lib/raster/gdal.c

@@ -100,6 +100,8 @@ static void load_library(void)
 	"libgdal.so",
 # endif
 # ifdef _WIN32
+	"gdal16.dll",
+	"gdal15.dll",
 	"gdal11.dll",
 	"gdal.1.0.dll",
 	"gdal.dll",