Remove clock related code

wrapper.pyx

@@ -9,8 +9,6 @@ cdef extern from "<unistd.h>" nogil:
 from libcpp.deque cimport deque
 ctypedef deque[coro_t *] coro_deque_t
 
-from libc.time cimport CLOCKS_PER_SEC, clock_t, clock
-
 cdef extern from "lwan/lwan-coro.h" nogil:
   ctypedef struct coro_switcher_t:
     pass
@@ -237,12 +235,9 @@ cdef void worker_destroy(worker_t *worker) nogil:
 def main():
   cdef:
     scheduler_t s
-    clock_t begin, end
     unsigned int i
 
   with nogil:
-    begin = clock()
-
     scheduler_init(&s)
 
     for i in range(500):
@@ -251,9 +246,6 @@ def main():
     scheduler_run(&s)
     scheduler_destroy(&s)
 
-    end = clock()
-    printf("%f\n", <double>(end - begin) / CLOCKS_PER_SEC)
-
 # Example task
 cdef int task(coro_t *coroutine, void *arg) nogil:
   cdef int a = 5