setup: drop the hack to disable linker warning 4197 on Windows
I don't see this when building on Windows with py3.8 or py3.12, so either the
code was fixed, or (more likely) the compiler stopped warning about it some time
after VS 2008. If we do have to put this back, it would probably be better to
put a `#pragma` in a header file somewhere, and avoid `setuptools` technical
debt.
$ rm -rf a
$ hg init a
$ cd a
$ echo a > a
$ hg ci -Am0
adding a
$ hg tag t1 # 1
$ hg tag --remove t1 # 2
$ hg co 1
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg tag -f -r0 t1
$ hg tags
tip 3:a49829c4fc11
t1 0:f7b1eb17ad24
Ensure that the username access fails gracefully if assumptions about the
environment made by python do not hold.
#if windows
>>> import os
>>> from mercurial import util
>>> os.environ.pop('LOGNAME', None) and None
>>> os.environ.pop('USER', None) and None
>>> os.environ.pop('LNAME', None) and None
>>> os.environ.pop('USERNAME', None) and None
>>> print(util.username())
None
#endif
$ cd ..