[gdk-pixbuf] tests: Add test for bug 776040

[Bastien Nocera <hadess src gnome org>]

commit 925eac56ebacc2621ff5bbb88ed24cd5ac3ca0f3
Author: Bastien Nocera <hadess hadess net>
Date:   Wed Dec 14 12:01:16 2016 +0100

    tests: Add test for bug 776040
    
    https://bugzilla.gnome.org/show_bug.cgi?id=776040

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