cythonize subprocess calls should use calling environment

[timkpaine]

Summary:
If the environment variables differ between process and subprocess, cythonize can call incorrect version of cython. To repro/see why its an issue, try to build spaCy in a 32bit virtual environment with a 64bit system python. Subprocess calls will use 64bit python rather than 32bit python.

Steps to resolve:
subprocess calls in cythonize should use shell=True, env=os.environ args.

I can do a pull request if this is something you think should be done. Otherwise the code works fine when patched manually for my install.

Environment:
Python 2.7, Windows 7, spaCy v1.6.0
64bit system python with 32bit virtual environment

[honnibal]

!!

So that's what's been going on. Awesome work. Yes, please write the PR!

[timkpaine]

Will do

[timkpaine]

Thanks!

[lock]

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