Allow ensurepip to work without bundled wheels

[FFY00]

BPO	42022
Nosy	@ncoghlan, @dstufft, @pradyunsg, @pganssle, @FFY00

^{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 = None
closed_at = <Date 2021-05-20.19:34:02.440>
created_at = <Date 2020-10-12.20:43:50.817>
labels = ['type-feature', 'library', '3.10']
title = 'Allow ensurepip to work without bundled wheels'
updated_at = <Date 2021-05-20.19:34:02.439>
user = 'https://github.com/FFY00'

bugs.python.org fields:

activity = <Date 2021-05-20.19:34:02.439>
actor = 'FFY00'
assignee = 'none'
closed = True
closed_date = <Date 2021-05-20.19:34:02.440>
closer = 'FFY00'
components = ['Library (Lib)']
creation = <Date 2020-10-12.20:43:50.817>
creator = 'FFY00'
dependencies = []
files = []
hgrepos = []
issue_num = 42022
keywords = []
message_count = 2.0
messages = ['378524', '394054']
nosy_count = 5.0
nosy_names = ['ncoghlan', 'dstufft', 'pradyunsg', 'p-ganssle', 'FFY00']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue42022'
versions = ['Python 3.10']

[FFY00]

Some Linux distributions, such as Debian, have guidelines against shipping things like prebuilt wheels.

Taking Debian as an example, they remove the pip and setuptools wheels and consequently break ensurepip. This also has some implications in the venv module.

As a way to fix this, I would like to propose for ensurepip to install .pth files pointing to the pip and setuptools packages in purelib/platlib.

This behavior could either be switched on by a flag in the makefile or, maybe, if the wheels are not found.

Do you think this would be a reasonable approach?
Currently, we cannot rely on the ensurepip to work. Some projects that really need it are shipping a vendored version of the module.

[FFY00]

Closing as the new --with-wheel-pkg-dir option provides an alternative mechanism.