fix(Cython): re-enable cythonization in Cython gates, do not enforce typing (#2122)

Author: vytas7

setup.py

@@ -124,7 +124,7 @@ def list_modules(dirname, pattern):
     # NOTE(vytas): Now that all our codebase is Python 3.5+, specify the
     #   Python 3 language level for Cython as well to avoid any surprises.
     for ext_mod in ext_modules:
-        ext_mod.cython_directives = {'language_level': '3'}
+        ext_mod.cython_directives = {'language_level': '3', 'annotation_typing': False}
 
     cmdclass = {'build_ext': ve_build_ext}
     return cmdclass, ext_modules

tox.ini

@@ -166,6 +166,7 @@ commands = python "{toxinidir}/tools/clean.py" "{toxinidir}/falcon"
 
 [with-cython]
 deps = -r{toxinidir}/requirements/tests
+       Cython
 setenv =
     PIP_CONFIG_FILE={toxinidir}/pip.conf
     FALCON_DISABLE_CYTHON=