[issue29075] Update WINVER to Windows 7

[Steve Dower]

New submission from Steve Dower:

Windows Vista SP2 is out of support by the time that Python 3.7 releases (see PEP 0537 and [1]), so we should do the following tasks:

*  update the definition of Py_WINVER in PC/pyconfig.h to 0x0601 _WIN32_WINNT_WIN7
* remove any dynamic API imports that are not required on Win7 (I don't think there are many, if any)
* remove pre-Win7 supportedOS elements from PC/python.manifest
* block Windows Vista in the installer

We may also be able to take advantage of new flags, particularly related to security (I think LoadLibrary[Ex] got new flags).

If there's anything else we need to do, post it here so we don't forget.

References:
[1]: https://support.microsoft.com/en-us/lifecycle/search?alpha=Windows%20Vista%20Service%20Pack%202

----------
components: Windows
messages: 284034
nosy: paul.moore, steve.dower, tim.golden, zach.ware
priority: normal
severity: normal
stage: needs patch
status: open
title: Update WINVER to Windows 7
type: enhancement
versions: Python 3.7

_______________________________________
Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue29075>
_______________________________________