attempting to fix pip install Cython issues.

My last commit that fixed the python version still has issues at the
Cython install step. As best I can tell, this was added per the iOS
packaging guide from kivy:

 * https://kivy.org/doc/stable-1.11.1/guide/packaging-ios.html

That said, I don't do it in my downstream buildDmg.sh script for
buskill:

 * https://github.com/BusKill/buskill-app/blob/e1eb601c7307476de98eaa04164bf5736beec005/build/mac/buildDmg.sh#L121-L128

So this build just attempts to comment-it-out. Maybe we don't need
Cython at all? If this build fails, then I'll try to mimic the buskill
buildDmg.sh above, which literally installs the pip wheel directly from
the repo itself

  Kivy-1.11.1-cp37-cp37m-macosx_10_6_intel.macosx_10_9_intel.macosx_10_9_x86_64.macosx_10_10_intel.macosx_10_10_x86_64.whl

Author: maltfield

build/mac/buildDmg.sh

@@ -63,7 +63,7 @@ ${PIP_PATH} install --upgrade --force-reinstall --user pip setuptools
 
 # install kivy and all other python dependencies with pip into our virtual env
 #source /tmp/kivy_venv/bin/activate
-${PIP_PATH} install --upgrade --force-reinstall --user Cython==0.29.10 || exit 1
+#${PIP_PATH} install --upgrade --force-reinstall --user Cython==0.29.10 || exit 1
 ${PIP_PATH} install --upgrade --force-reinstall --user -r requirements.txt || exit 1
 ${PIP_PATH} install --upgrade --force-reinstall --user PyInstaller || exit 1