Cython speedup extension is not found

[int19h]

This is on Python 3.6 32-bit - the following message is printed when debugging starts:

warning: Debugger speedups using cython not found. Run '"C:\Python\3.6-32\python.exe" "C:\Python\3.6-32\lib\site-packages\ptvsd\pydevd\setup_cython.py" build_ext
--inplace' to build.

This is despite .pyd files being in their usual locations. Probably this is happening because Cython stuff is loaded dynamically, and by the time pydevd tries to load it, we've already removed the sys.path entry.

[DonJayamanne]

@int19h @zooba
Currently we're bundling PTVSD with VSC, and when we start the debugger we're getting these messages.
Is there anything we need to do in VSC to get the cython optimizations?

[int19h]

Which Python version is that? IIRC the binaries are 3.x-only.