Start building with Cython 0.24.

This makes the builds faster due to smaller .c output to merge. Plus all
the improvements in Cython itself.

*NOTE* Not taking advantage of the new @property supporty yet, in case
 there are any changes to the .ppyx file we need to backport to 1.1.

changelog.rst

@@ -28,6 +28,7 @@ Libraries
   installation time. Previously, if it wasn't available, a build was
   attempted at every import. This could lead to scattered "gevent"
   directories and undependable results.
+- Update Cython to 0.24.
 
 
 Security

dev-requirements.txt

 setuptools
 wheel
-cython>=0.23.4
+cython>=0.24
 greenlet>=0.4.9
 prospector[with_pyroma]
 coverage>=4.0

setup.py

@@ -468,7 +468,7 @@ if run_make and os.path.exists("Makefile"):
     # NOTE: This is effectively pointless and serves only for
     # documentation/metadata, because we run 'make' *before* we run
     # setup(), so installing cython happens too late.
-    setup_requires = ['cython >= 0.23.4']
+    setup_requires = ['cython >= 0.24']
 else:
     setup_requires = []
 

tox.ini

@@ -5,7 +5,7 @@ envlist =
 [testenv]
 deps =
     greenlet
-    cython >= 0.23.4
+    cython >= 0.24
     coverage >= 4.0
     psutil
     cffi