Fix gtksourceview update script

Fix gtksourceview update script. It could consider .tar.gz suffixes
part of the version number.

Problem reported by Niels Kristian Bech Jensen <nkbj1970@hotmail.com>.
Package fltk: update download URL
Update package gdal
Update package imagemagick
Update package netcdf
Update package netpbm
Update package ocaml-flexdll
Update package pixman