use PyBytes_FromString instead of PyString_FromString (py3k)

gevent/ares.pyx

@@ -27,7 +27,7 @@ cdef extern from "dnshelper.c":
     # this imports _socket lazily
     object get_socket_error()
     object get_socket_gaierror()
-    object PyString_FromString(char*)
+    object PyBytes_FromString(char*)
     int PyTuple_Check(object)
     int PyArg_ParseTuple(object, char*, ...) except 0
     struct sockaddr_in6:
@@ -207,11 +207,11 @@ cdef void gevent_ares_nameinfo_callback(void *arg, int status, int timeouts, cha
             callback(result(None, get_socket_gaierror()(status, strerror(status))))
         else:
             if c_node:
-                node = PyString_FromString(c_node)
+                node = PyBytes_FromString(c_node)
             else:
                 node = None
             if c_service:
-                service = PyString_FromString(c_service)
+                service = PyBytes_FromString(c_service)
             else:
                 service = None
             callback(result((node, service)))