I computed these using a build of the Go toolchain from a working copy at
https://golang.org/cl/128136, patchset 12.

The versions selected by 'go mod tidy' needed two tweaks to pass tests:
go get golang.org/x/text@master
go get github.com/russross/blackfriday@v1

The x/text version bump is because the last tagged version (v0.3.0) is very old
(last December).

The blackfriday bump is because the repository made a breaking change (v2.0.0)
without changing the import path.

With those changes, 'go test ./...' passes at the repo root.
('go test all' fails, possibly due to golang/go#26279.)

Updates golang/go#26279.
Updates golang/go#26872.

Change-Id: Ieac5327e4bddd2b78b981d7683beb98608708a3a
Reviewed-on: https://go-review.googlesource.com/128636
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

Also, along for the ride:

* update from jessie to stretch
* update from Go 1.10 to Go 1.12
* move to multi-stage Dockerfile, including drawterm, reducing image size
* remove the static linking which was resulting in build warnings
* clean up Makefile

Updates golang/go#26872
Updates golang/go#27719

Change-Id: Ic4dc9b8539fb8662c9621c113fa94b70bc7de061
Reviewed-on: https://go-review.googlesource.com/c/build/+/175985
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>

…o modules

Updates golang/go#26872
Updates golang/go#27719

Change-Id: I4de6d4f157b349911362e02b1781abd8b813f87a
Reviewed-on: https://go-review.googlesource.com/c/build/+/176257
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>

Updates golang/go#26872

Change-Id: If2a96708d1fcf43b7ce20a48fa5ae3492f970187
Reviewed-on: https://go-review.googlesource.com/c/net/+/176318
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>

Also, modernize the Dockerfile while I'm at it, using multi-stage
builds more aggressively, and stop using gitlock (golang/go#26872) and
switch to using Go modules to build the playground. (This also turns
the playground into a module.)

Updates golang/go#31944

Change-Id: Ic6f6152469f1930fd04180a3d1e63ed92ea2cfbd
Reviewed-on: https://go-review.googlesource.com/c/playground/+/176317
Reviewed-by: Yury Smolsky <yury@smolsky.by>

Updates golang/go#26872

Change-Id: I7cf1bc512f7e4ab6592c1d645b95c7d135bd6c59
Reviewed-on: https://go-review.googlesource.com/c/build/+/176600
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>

Updates golang/go#26872

Change-Id: If64b03c03f29ccff2ffcf255d94a2c736806af89
Reviewed-on: https://go-review.googlesource.com/c/build/+/176602
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>

And update to multi-stage Dockerfiles, simplifying the build and
making it more consistent with others.

Updates golang/go#26872

Change-Id: If26e19d73c9bdb996343468cd1cff8edc574cb17
Reviewed-on: https://go-review.googlesource.com/c/build/+/176603
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>

This removes the last two gitlock users, so this also deletes gitlock.

And update to multi-stage Dockerfiles, simplifying the build and
making it more consistent with others.

Updates golang/go#26872

Change-Id: I1e38c65eccfe9b8b7cb2d9acd6eb02aa33f8b877
Reviewed-on: https://go-review.googlesource.com/c/build/+/176604
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Andrew Bonventre <andybons@golang.org>

The new x/website is built in module mode. Now that proxy.golang.org
is available publicly, cmd/tip can start using it for fetching modules
when building x/website.

Also make a change to newServeMux so that httpsOnlyHandler is only used
when HTTPS is turned on. That stops redirecting to HTTPS when HTTPS is
not being served, thereby fixing HTTP-only local development mode.

Updates golang/go#26872
Updates golang/go#30232
Updates golang/go#29206

Change-Id: If0382c45b9c99540adce3a894054730f5a7a9fdb
Reviewed-on: https://go-review.googlesource.com/c/build/+/177217
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

CL 176257 refactored the Dockerfile to remove the use of gitlock but I
forgot to include ca-certificates here.

Updates golang/go#32272 (fixes maybe)
Updates golang/go#26872

Change-Id: I7b0e3a756bc9805e81e499b8b7d7c6ed0defb871
Reviewed-on: https://go-review.googlesource.com/c/build/+/179077
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>

This script was used when a custom gitlock tool was used for package
management. That approach has been superseded with the switch to the
module mode, and gitlock was deleted in CL 176604. By now, there are
no directories with an update-deps make target remaining.

For golang/go#26872.

Change-Id: Ia7f5d9e8b277be55010d5752523d1160b72115b2
Reviewed-on: https://go-review.googlesource.com/c/build/+/227440
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Carlos Amedee <carlos@golang.org>
Reviewed-by: Alexander Rakoczy <alex@golang.org>
Run-TryBot: Alexander Rakoczy <alex@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>