Pyrex 0.9.2 fixes compile problems

[Peter]

that were introduced with 0.9.1.1

Remember to edit setup.py to correct two small errors as follows where I
have # NEW

import sys  # NEW
from distutils.core import setup
from distutils.sysconfig import get_python_lib
import os.path
from Pyrex.Compiler.Version import version

dfile_dir = os.path.join(get_python_lib(prefix=''), 'Pyrex/Compiler')

if sys.platform in ("unix", "darwin", "linux2"):  # "linux2" is NEW