tracker-extract: Add support for giflib 5.
tracker-extract: Add support for giflib 5.

https://bugzilla.gnome.org/show_bug.cgi?id=695769

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