Remove unused "time_func"

This compat name is not used and is also referring to a
deprecated API for the win32 case.

Fixes: #4731
Change-Id: I0f2b07347c15455b58c27e29a19fb55e159f332a

lib/sqlalchemy/util/compat.py

@@ -12,7 +12,6 @@
 import inspect
 import operator
 import sys
-import time
 
 
 py36 = sys.version_info >= (3, 6)
@@ -349,11 +348,6 @@ def inspect_formatargspec(*spec, **kw):
     from inspect import formatargspec as inspect_formatargspec  # noqa
 
 
-if win32 or jython:
-    time_func = time.clock
-else:
-    time_func = time.time
-
 # Fix deprecation of accessing ABCs straight from collections module
 # (which will stop working in 3.8).
 if py33: