[MacPorts] #16172: gambit-c update to 4.2.8

[MacPorts]

#16172: gambit-c update to 4.2.8
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 Reporter:  pmq at macports.org  |       Owner:  arto.bendiken at gmail.com
     Type:  enhancement       |      Status:  new                    
 Priority:  Normal            |   Milestone:  Port Enhancements      
Component:  ports             |     Version:  1.6.0                  
 Keywords:                    |  
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 Version bump to 4.2.8.
 Doesn't fix Ticket #12074.

 Hi Arto,
 Tell me if it's OK to commit it.

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Ticket URL: <http://trac.macports.org/ticket/16172>
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