gc: delete DUPOK definition
gc: delete DUPOK definition

The relevant header is already included.

R=ken2
CC=golang-dev
http://codereview.appspot.com/5487062

gnanderson/go,gnanderson/go,dsriram/golang,tv42/old-go,tv42/old-go,apparentlymart/golang,dsriram/golang,tv42/old-go,dsriram/golang,pombredanne/go-deleteme,apparentlymart/golang,dsriram/golang,tv42/old-go,gnanderson/go,pombredanne/go-deleteme,gnanderson/go,pombredanne/go-deleteme,apparentlymart/golang,pombredanne/go-deleteme,pombredanne/go-deleteme,apparentlymart/golang,apparentlymart/golang,tv42/old-go,gnanderson/go,pombredanne/go-deleteme,gnanderson/go,dsriram/golang,tv42/old-go,apparentlymart/golang,apparentlymart/golang,pombredanne/go-deleteme,gnanderson/go,tv42/old-go,dsriram/golang,dsriram/golang