automation: drop support for Python 2.7 in Windows environment
We stop installing Python 2.7 in the Windows environment.
We remove support for building Python 2.7 wheels and installers.
There is still some Python 2.7 support cleanup to perform in automation.
But this removes the biggest remaining chunk of references to 2.7.
Differential Revision: https://phab.mercurial-scm.org/D12263
Mercurial
=========
Mercurial is a fast, easy to use, distributed revision control tool
for software developers.
Basic install::
$ make # see install targets
$ make install # do a system-wide install
$ hg debuginstall # sanity-check setup
$ hg # see help
Running without installing::
$ make local # build for inplace usage
$ ./hg --version # should show the latest version
See https://mercurial-scm.org/ for detailed installation
instructions, platform-specific notes, and Mercurial user information.
Notes for packagers
===================
Mercurial ships a copy of the python-zstandard sources. This is used to
provide support for zstd compression and decompression functionality. The
module is not intended to be replaced by the plain python-zstandard nor
is it intended to use a system zstd library. Patches can result in hard
to diagnose errors and are explicitly discouraged as unsupported
configuration.