unnecessary hg required for build version 3.6 on Windows

[josephsmeng]

BPO	29080
Nosy	@pfmoore, @tjguk, @zware, @zooba, @josephsmeng
PRs	[Do Not Merge] Convert Misc/NEWS so that it is managed by towncrier #552

^{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 2016-12-28.22:39:33.793>
created_at = <Date 2016-12-27.09:53:02.808>
labels = ['build', '3.7', 'OS-windows']
title = 'unnecessary hg required for build version 3.6 on Windows'
updated_at = <Date 2017-03-31.16:36:27.629>
user = 'https://github.com/josephsmeng'

bugs.python.org fields:

activity = <Date 2017-03-31.16:36:27.629>
actor = 'dstufft'
assignee = 'steve.dower'
closed = True
closed_date = <Date 2016-12-28.22:39:33.793>
closer = 'steve.dower'
components = ['Build', 'Windows']
creation = <Date 2016-12-27.09:53:02.808>
creator = 'josephsmeng'
dependencies = []
files = []
hgrepos = []
issue_num = 29080
keywords = []
message_count = 4.0
messages = ['284078', '284130', '284204', '284212']
nosy_count = 6.0
nosy_names = ['paul.moore', 'tim.golden', 'python-dev', 'zach.ware', 'steve.dower', 'josephsmeng']
pr_nums = ['552']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'compile error'
url = 'https://bugs.python.org/issue29080'
versions = ['Python 3.6', 'Python 3.7']

[josephsmeng]

the released 3.6.0 PCbuild/build.bat required hg for building. but this requirement is not necessary for build python from source. maybe it will be better for us to remove this requirement as the old versions.

[zooba]

You're right. I moved that code from buildrelease.bat, which definitely requires hg.

PC/build.bat should not fail if hg can't be found. You'll just end up with an empty sys._mercurial/sys.version after building.

[python-dev]

New changeset bc71c144e6f0 by Steve Dower in branch '3.5':
Issue bpo-29080: Removes hard dependency on hg.exe from PC/build.bat
https://hg.python.org/cpython/rev/bc71c144e6f0

New changeset f98d8c9f3cde by Steve Dower in branch '3.6':
Issue bpo-29080: Removes hard dependency on hg.exe from PC/build.bat
https://hg.python.org/cpython/rev/f98d8c9f3cde

New changeset 57c2fc60c989 by Steve Dower in branch 'default':
Issue bpo-29080: Removes hard dependency on hg.exe from PC/build.bat
https://hg.python.org/cpython/rev/57c2fc60c989

[python-dev]

New changeset 84beb5cba826 by Steve Dower in branch '3.5':
Issue bpo-29080: Fixes Misc/NEWS entry
https://hg.python.org/cpython/rev/84beb5cba826

New changeset 048d1942b325 by Steve Dower in branch '3.6':
Issue bpo-29080: Fixes Misc/NEWS entry
https://hg.python.org/cpython/rev/048d1942b325

New changeset 38e44a23ea66 by Steve Dower in branch 'default':
Issue bpo-29080: Fixes Misc/NEWS entry
https://hg.python.org/cpython/rev/38e44a23ea66