Use x64 native compiler for Windows MSVC

[TonyXiang8787]

I noticed that setuptools uses the HostX86\x64 cross MSVC compiler in Windows. After some research I find the following code segment in _msvccompiler.py

# A map keyed by get_platform() return values to values accepted by
# 'vcvarsall.bat'. Always cross-compile from x86 to work with the
# lighter-weight MSVC installs that do not include native 64-bit tools.
PLAT_TO_VCVARS = {
    'win32': 'x86',
    'win-amd64': 'x86_amd64',
    'win-arm32': 'x86_arm',
    'win-arm64': 'x86_arm64',
}

I can understand the default behavior is to choose x86 cross compiler. But there seems to be no way to go around it and specify that I want native x64 compiler. I tried to do this at the beginning of setup.py, but it does not work. It still use the cross compiler.

from setuptools._distutils._msvccompiler import PLAT_TO_VCVARS
PLAT_TO_VCVARS["win-amd64"] = "amd64"

Sometimes we hit memory limit of x86 compiler so we have to use native x64 compiler. But how can we do this? Maybe we can add an option to let the user to set the preferred compiler?