Remove no-gil cdivision error test.

tests/errors/e_cython_parallel_nogil_env.pyx

-# mode: error
-
-from cython.parallel import *
-def psum(int n):
-   cdef double sum
-   cdef int i
-   cdef double x,step,t1,t2
-   sum=0
-   step=1.0/n
-   for i in prange(n,nogil=True):
-       x = (i)*step
-       sum+=4.0/(1.0+x*x)
-   return sum*step
-
-_ERRORS = u"""
-e_cython_parallel_nogil_env.pyx:12:15: Pythonic division not allowed without gil, consider using cython.cdivision(True)
-"""