Make PCbuild/build.bat build x64 by default

[zooba]

BPO	42336
Nosy	@tim-one, @pfmoore, @tjguk, @ned-deily, @zware, @zooba, @miss-islington
PRs	bpo-42336: Improve PCbuild batch files #23275 [3.8] bpo-42336: Improve PCbuild batch files (GH-23275) #23325 [3.9] bpo-42336: Improve PCbuild batch files (GH-23275) #23372 [3.7] bpo-42336: Improve PCbuild batch files (GH-23325) #23373

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = 'https://github.com/zooba'
closed_at = <Date 2020-11-21.01:10:15.149>
created_at = <Date 2020-11-12.22:50:50.338>
labels = ['3.10', 'build', '3.9', 'OS-windows']
title = 'Make PCbuild/build.bat build x64 by default'
updated_at = <Date 2020-11-21.01:10:15.147>
user = 'https://github.com/zooba'

bugs.python.org fields:

activity = <Date 2020-11-21.01:10:15.147>
actor = 'steve.dower'
assignee = 'steve.dower'
closed = True
closed_date = <Date 2020-11-21.01:10:15.149>
closer = 'steve.dower'
components = ['Build', 'Windows']
creation = <Date 2020-11-12.22:50:50.338>
creator = 'steve.dower'
dependencies = []
files = []
hgrepos = []
issue_num = 42336
keywords = ['patch']
message_count = 8.0
messages = ['380858', '380860', '380942', '381360', '381361', '381363', '381367', '381513']
nosy_count = 7.0
nosy_names = ['tim.peters', 'paul.moore', 'tim.golden', 'ned.deily', 'zach.ware', 'steve.dower', 'miss-islington']
pr_nums = ['23275', '23325', '23372', '23373']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue42336'
versions = ['Python 3.9', 'Python 3.10']

[zooba]

Now that the 64-bit download is the default on python.org, we should make the build command default to 64-bit as well.

This should only affect contributors, so should be non-controversial. But we should add a "-x86" option to the batch file as well.

[tim-one]

+1. If you're feeling more ambitious, it would also be good to change build.bat and rt.bat to use the same "which platform?" spellings and with the same defaults.

[zooba]

I hope you'll find that PR suitable ambitious :)

It would really be nice to have proper Powershell scripts for these, but that would be a more significant rewrite (and probably require changing argument names...). I'm not *that* ambitious.

[zooba]

New changeset 2156d96 by Steve Dower in branch 'master':
bpo-42336: Improve PCbuild batch files (GH-23275)
2156d96

[zooba]

New changeset 8b1f4cc by Steve Dower in branch '3.8':
bpo-42336: Improve PCbuild batch files (GH-23325)
8b1f4cc

[miss-islington]

New changeset 37f6fe2 by Miss Islington (bot) in branch '3.9':
bpo-42336: Improve PCbuild batch files (GH-23275)
37f6fe2

[ned-deily]

New changeset 9ae1742 by Steve Dower in branch '3.7':
[3.7] bpo-42336: Improve PCbuild batch files (GH-23325) (GH-23373)
9ae1742

[zooba]

We also updated the buildbot config to use the new options.