Don't use stdout=PIPE when generating Python modules
Don't use stdout=PIPE when generating Python modules

When generating Python modules, use of stdout=PIPE or stderr=PIPE in
subprocess.call() can generate enough output that the OS pipe buffer
blocks, resulting in a compilation failure of generated code. For more
information, see Python documentation here:
https://docs.python.org/3/library/subprocess.html#subprocess.call

This commit resolves https://github.com/pydy/pydy/issues/290.

oliverlee/pydy,oliverlee/pydy,oliverlee/pydy