python detection v windows

I just tried building with Python on msys2. However, the setup of the
latest python doesn't fit our detection code. I see this:

# /c/Python37/python -c 'import distutils.sysconfig;
print(distutils.sysconfig.get_config_vars());'

{'LIBDEST': 'C:\\Python37\\Lib', 'BINLIBDEST': 'C:\\Python37\\Lib',
'INCLUDEPY': 'C:\\Python37\\include', 'EXT_SUFFIX':
'.cp37-win_amd64.pyd', 'EXE': '.exe', 'VERSION': '37', 'BINDIR':
'C:\\Python37', 'prefix': 'C:\\Python37', 'exec_prefix': 'C:\\Python37',
'SO': '.cp37-win_amd64.pyd', 'srcdir': 'C:\\Python37'}

The python3.dll and python37.dll files are in c:\\python37, i.e. the
BINDIR as one might expect on Windows.

It would be nice to get this working.

cheers

andrew

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Andrew Dunstan https://www.2ndQuadrant.com
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