[gdk-pixbuf] tests: Add a test image for extra large dimensions in TIFF loader

[Bastien Nocera <hadess src gnome org>]

commit 3b8559efaa0907c8b9a1ae5e6db7f62cca331c62
Author: Bastien Nocera <hadess hadess net>
Date:   Thu Jul 13 17:06:12 2017 +0200

    tests: Add a test image for extra large dimensions in TIFF loader
    
    Overflow checks were added in commit 14904cb842.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=784903

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