This patch will allow upper case file names to display
in the GTK file chooser window. I was annoyed that I
had a file named "FOO.ISO" that wouldn't display in the
window for burning, so I hacked up this quick patch.
It also adds support for upper-cased CUE and TOC files.
Let me know if you have any questions or have problems
with this patch. It is a pretty simple addition, so I
don't think anyone should have issues...