[MacPorts] #16700: Remove libgtkhtml312 port

[MacPorts]

#16700: Remove libgtkhtml312 port
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 Reporter:  macsforever2000 at macports.org  |       Owner:  nox at macports.org
     Type:  enhancement                   |      Status:  new             
 Priority:  Normal                        |   Milestone:  Port Requests   
Component:  ports                         |     Version:  1.6.0           
 Keywords:  libgtkhtml3                   |        Port:  libgtkhtml312   
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 The libgtkhtml312 port is not required by any other port now. It should be
 removed from the port tree. libgtkhtml3 should be used instead.

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Ticket URL: <http://trac.macports.org/ticket/16700>
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