C: add Thomas Habets (Google CLA)

R=golang-dev, dsymonds
CC=golang-dev
https://codereview.appspot.com/13501050
net/http/cgi: use 'https://' for urls if HTTPS is set.

R=golang-dev, adg
CC=golang-dev
https://codereview.appspot.com/13700044

Committer: Andrew Gerrand <adg@golang.org>