Pin pycparser by Git commit
Pin pycparser by Git commit

As a (hopefully temporary) workaround to
https://github.com/eliben/pycparser/issues/147
indygreg/python-zstandard,terrelln/python-zstandard,indygreg/python-zstandard,terrelln/python-zstandard,terrelln/python-zstandard,indygreg/python-zstandard,terrelln/python-zstandard,indygreg/python-zstandard