cmd/gotype: re-introduce gotype command at traditional location

Except for the added comment in the beginning and the removal of
the 'ignore' build tag, there is no difference between gotype.go
and the original.

Fixes golang/go#19516.

Change-Id: Ie1ab9aced6e650573c2cdce0c165af1e1094213f
Reviewed-on: https://go-review.googlesource.com/38132
Reviewed-by: Alan Donovan <adonovan@google.com>
1 file changed