win32 setup script to install pycuda, nvapi

[totaamwin32]

As per ticket:1413#comment:2.

[Antoine Martin]

Downloading CUDA requires authentication, so this can't be fully automated.

[Antoine Martin]

Updated instructions:

• install latest ​CUDA (tested with v10.2)
• download ​​pycuda and build it (tested with 2019.2):

  python3 ./configure.py --cuda-root="c:\\Program Files\\NVIDIA GPU Computing Toolkit\\CUDA\\v10.2"
  

• remove "/EHsc" and "/FORCE" from siteconf.py.
• add BOOST_USE_WINDOWS_H=1 in EXTRA_DEFINES of setup.py to workaround this boost bug: [​​http://stackoverflow.com/questions/18134148/ Undefined reference to InterlockedCompareExchange? with boost.thread on mingw64 (but not on mingw32)]
• python3 ./setup.py build -c mingw32
• python3 ./setup.py install

There are some new dependencies: mako, pytools, markupsafe.

[migration script]

this ticket has been moved to: ​https://github.com/Xpra-org/xpra/issues/2400