4235ef3 Drop support to gtk2

Authored and Committed by fidencio 8 years ago
    Drop support to gtk2
    
    The 3.0 release was the last one that still supports GTK2. For the
    Windows builds the support to GTK2 was dropped in the previous release.
    Let's do the same for the entire project now.
    
    Signed-off-by: Eduardo Lima (Etrunko) <etrunko@redhat.com>
    
        
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