* .gitignore: Add some new generated files.
* tools/Makefile.am: Add extra_defs_gen/generate_defs_gdk.
Rename extra_defs_gen/generate_extra_defs to generate_defs_gtk.
* tools/extra_defs_gen/generate_defs_gtk.cc: Don't get defs for gdk classes.
* tools/gen_scripts/gtk_generate_extra_defs.sh: Rename extra_defs_gen/
generate_extra_defs to generate_defs_gtk.
* tools/extra_defs_gen/generate_defs_gdk.cc: New file. Get defs for
gdk classes.
* tools/gen_scripts/gdk_generate_extra_defs.sh: New file. Execute
generate_defs_gdk.