[gdk-pixbuf] tests: Add test for bug 775242

[Bastien Nocera <hadess src gnome org>]

commit 08e388f2c8cf253d6acd226b086ed9c24ab10bad
Author: Bastien Nocera <hadess hadess net>
Date:   Tue Dec 13 18:17:56 2016 +0100

    tests: Add test for bug 775242
    
    https://bugzilla.gnome.org/show_bug.cgi?id=775242

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