if undefined, define Py_HUGE_VAL the way CPython does it (for PyPy)

--HG--
extra : transplant_source : %D9%C4%E5%B7%FC9%0D%60%80R%E2%87%82S%9D%9C%8Bd%C3%C5

Cython/Utility/ModuleSetupCode.c

@@ -28,6 +28,10 @@
   #define PY_LONG_LONG LONG_LONG
 #endif
 
+#ifndef Py_HUGE_VAL
+  #define Py_HUGE_VAL HUGE_VAL
+#endif
+
 #ifdef PYPY_VERSION
 #define CYTHON_COMPILING_IN_PYPY 1
 #define CYTHON_COMPILING_IN_CPYTHON 0