[dev.power64] 9l: remove enum as's tag for c2go
[dev.power64] 9l: remove enum as's tag for c2go

None of the other compilers have a tag for this enum.
Cleaning all of this up to use proper types will happen after
the conversion.

LGTM=minux, rsc
R=rsc, minux
CC=golang-codereviews
https://codereview.appspot.com/166690043

bryanxu/go-zh,bryanxu/go-zh,d0f/go-zh,d0f/go-zh,webfd/go-zh,d0f/go-zh,d0f/go-zh,bryanxu/go-zh,bryanxu/go-zh,bryanxu/go-zh,bryanxu/go-zh,d0f/go-zh,webfd/go-zh,webfd/go-zh,webfd/go-zh,d0f/go-zh,d0f/go-zh,webfd/go-zh,d0f/go-zh,bryanxu/go-zh,webfd/go-zh,bryanxu/go-zh,webfd/go-zh,webfd/go-zh