Makefile Cython Version Outdated

[tiago1405]

The Makefile on the repo is seemingly outdated causing the following error when make sysinstall was used:

Failed building wheel for cython neon
failed with error code 1 in /tmp/pip-install-0vxv6117/cython/

The error occurred when the sysinstall attempted to install Cython v:0.23.1. Using the commands
pip install cython or conda install cython would not resolve the issue as they were installing the newer Cython v:0.29.1.

I fixed this by correcing the cython version number at these two lines at in the Makefile:

(127)$(ACTIVATE); pip install cython==0.23.
(170)@pip install cython==0.23.1

----> TO ---->

(127)$(ACTIVATE); pip install cython==0.29.1
(170)@pip install cython==0.29.1

I had some other issues installing Neon through make and make sysinstall but this allowed me to move forward with the installation.