Enable manifpy on Windows

[traversaro]

Windows build of manifpy using setup.py is failing with:

Created temporary directory: C:\Users\VSSADM~1\AppData\Local\Temp\pip-install-d9egm38t
Processing d:\bld\manif-split_1623860577772\work
  Created temporary directory: C:\Users\VSSADM~1\AppData\Local\Temp\pip-req-build-p5hncswq
  DEPRECATION: A future pip version will change local packages to be built in-place without first copying to a temporary directory. We recommend you use --use-feature=in-tree-build to test your packages with this new behavior before it becomes the default.
  File "D:\bld\manif-split_1623860577772\_h_env\lib\site-packages\pip\_internal\distributions\sdist.py", line 36, in prepare_distribution_metadata
    self.req.prepare_metadata()
  File "D:\bld\manif-split_1623860577772\_h_env\lib\site-packages\pip\_internal\req\req_install.py", line 563, in prepare_metadata
    self.metadata_directory = self._generate_metadata()
  File "D:\bld\manif-split_1623860577772\_h_env\lib\site-packages\pip\_internal\req\req_install.py", line 543, in _generate_metadata
    details=self.name or f"from {self.link}"
  File "D:\bld\manif-split_1623860577772\_h_env\lib\site-packages\pip\_internal\operations\build\metadata_legacy.py", line 70, in generate_metadata
    command_desc='python setup.py egg_info',
  File "D:\bld\manif-split_1623860577772\_h_env\lib\site-packages\pip\_internal\utils\subprocess.py", line 244, in call_subprocess
    raise InstallationSubprocessError(proc.returncode, command_desc)
pip._internal.exceptions.InstallationSubprocessError: Command errored out with exit status 1: python setup.py egg_info Check the logs for full command output.
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