gtkfilechooser: Fix open() references in documentation
While it’s true that you can pass the results of
gtk_file_chooser_get_filename() straight to open() or fopen() on
Linux, you can’t do so on Windows as it expects the filename to be in
the ANSI codepage. Using the GLib wrappers g_open()/g_fopen()
instead means that the appropriate UTF-8 → UTF-16 → wopen()/wfopen()
conversions are done.
Spotted by Fabian Keßler in glib#2212 (closed).
Signed-off-by: Philip Withnall pwithnall@endlessos.org
Only applies to gtk-3-24.