tracker-extract-gif: add compatibility with GIFLib 5.1.0
tracker-extract-gif: add compatibility with GIFLib 5.1.0

Signed-off-by: Dominique Leuenberger <dimstar@opensuse.org>

https://bugzilla.gnome.org/show_bug.cgi?id=736328

outofbits/tracker,outofbits/tracker,outofbits/tracker,outofbits/tracker,outofbits/tracker,outofbits/tracker,outofbits/tracker