[Bugs] #1899 UNSP: Do not use deprecated API

[Sugar Labs Bugs]

#1899: Do not use deprecated API
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    Reporter:  alsroot                    |          Owner:  benzea                     
        Type:  defect                     |         Status:  new                        
    Priority:  Unspecified by Maintainer  |      Milestone:  Unspecified by Release Team
   Component:  sugar-artwork              |        Version:  0.88.x                     
    Severity:  Unspecified                |       Keywords:                             
Distribution:  Unspecified                |   Status_field:  Unconfirmed                
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 Since Makefile.am contains -DGTK_DISABLE_DEPRECATED and there are
 deprecated API calls(at least GTK_WIDGET_HAS_FOCUS), libsugar.so is
 broken.

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Ticket URL: <https://bugs.sugarlabs.org/ticket/1899>
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