Fix test warning.

tests/compile/builtinfuncs.pyx

@@ -5,18 +5,20 @@ cdef int f() except -1:
     cdef str sstring
     cdef basestring sustring
     cdef int i
+    cdef long lng
+    cdef Py_ssize_t s
     x = abs(y)
     delattr(x, 'spam')
     x = dir(y)
     x = divmod(y, z)
     x = getattr(y, 'spam')
     i = hasattr(y, 'spam')
-    i = hash(y)
+    lng = hash(y)
     x = intern(y)
     i = isinstance(y, z)
     i = issubclass(y, z)
     x = iter(y)
-    i = len(x)
+    s = len(x)
     x = open(y, z)
     x = pow(y, z, w)
     x = pow(y, z)