Windows: Provide an option to disable search in CWD on `shutil.which`

I would like to search for an executable in the PATH but not from the current working directory (cwd). By default, as documented in shutil.which, it prepends the cwd before PATH, so it's not possible to get the expected executable.

For example, I have a whoami.exe in the cwd but I would like to get the one from the system32 directory; there's no way to do so using shutil.which.

>>> import shutil
>>> shutil.which('whoami')
'.\\whoami.EXE'

I think it makes sense for that to be the default behaviour since that's how it is on Windows. I would like to have a parameter to disable this behaviour in shutil.which.

Thanks!

从 shutil.which 入口点及其文档开始，重点关注 issue 中描述的 Windows 特定当前目录搜索。当调用方可以选择退出该搜索，并在 PATH 的后续位置找到匹配的可执行文件（包括 whoami.exe 示例）时，即视为完成。