X Cythonize in py2 mode

Previously it was failing with master:

(neo) (z-dev) (g.env) kirr@deco:~/src/tools/py/cython/t/compilebench$ ./doit.sh
/home/kirr/src/tools/py/cython/Cython/Compiler/Main.py:344: FutureWarning: Cython directive 'language_level' not set, using '3str' for now (Py3). This has changed from earlier releases! File: /home/kirr/src/tools/py/cython/t/compilebench/pystone_pyxtest.py
  tree = Parsing.p_module(s, pxd, full_module_name)

Error compiling Cython file:
------------------------------------------------------------
...
TRUE = 1
FALSE = 0

def main(loops=LOOPS):
    benchtime, stones = pystones(loops)
    print "Pystone(%s) time for %d passes = %g" % \
         ^
------------------------------------------------------------

pystone_pyxtest.py:62:10: Syntax error in simple statement list

t/compilebench/doit.sh

-#!/bin/sh
+#!/bin/sh -e
 # this program compares timings to compile and run pystone.py via cython and gcc/clang/tcc.
 
 export LANG=C.UTF-8	# . for floating point in e.g. time output
@@ -6,7 +6,7 @@ export LANG=C.UTF-8	# . for floating point in e.g. time output
 git clean -fdX
 cp pystone.py pystone_pyxtest.py # to be sure that 'import pystone_pyxtest' does not pick up py code
 
-cython pystone_pyxtest.py # -> pystone_pyxtest.c
+cython -2 pystone_pyxtest.py # -> pystone_pyxtest.c
 wc -l pystone_pyxtest.{py,c}
 rm pystone_pyxtest.py