replace cython_ifdef.py with cythonpp.py; m4 and unifdef are no longer needed to build gevent

* Rename core_.pyx to core.ppyx and use C preprocessor macros here instead of m4 macros

--HG--
rename : gevent/core_.pyx => gevent/core.ppyx

Makefile

@@ -2,23 +2,17 @@
 # run it.  If you want setup.py to run "make" automatically, rename it back to "Makefile".
 
 PYTHON ?= python
-CYTHON ?= cython
-M4 ?= m4
-
 
 all: gevent/gevent.core.c gevent/gevent.ares.c
 
-gevent/core.pyx: gevent/core_.pyx
-	$(M4) -P gevent/core_.pyx > core.pyx && mv core.pyx gevent/
-
-gevent/gevent.core.c: gevent/core.pyx gevent/libev.pxd
-	$(PYTHON) util/cython_ifdef.py -o gevent.core.c gevent/core.pyx
+gevent/gevent.core.c: gevent/core.ppyx gevent/libev.pxd util/cythonpp.py
+	$(PYTHON) util/cythonpp.py -o gevent.core.c gevent/core.ppyx
 	echo                          >> gevent.core.c
 	echo '#include "callbacks.c"' >> gevent.core.c
 	mv gevent.core.* gevent/
 
 gevent/gevent.ares.c: gevent/*.pyx gevent/*.pxd
-	$(CYTHON) -o gevent.ares.c gevent/ares.pyx
+	cython -o gevent.ares.c gevent/ares.pyx
 	mv gevent.ares.* gevent/
 
 clean: