[MacPorts] #41656: Update Go Portfile to 1.2

[MacPorts]

#41656: Update Go Portfile to 1.2
--------------------+--------------------------------
 Reporter:  b@…     |      Owner:  macports-tickets@…
     Type:  update  |     Status:  new
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:  2.2.1
 Keywords:  go      |       Port:  go
--------------------+--------------------------------
 Go 1.2 is officially released: http://blog.golang.org/go12
 Go 1.2 fixes several bugs with Clang compilation (confirmed on OS X 10.9),
 so clang should not be blacklisted anymore.

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Ticket URL: <https://trac.macports.org/ticket/41656>
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