Win32: fixed cpu hog by cache manager on exit (ticket #514). The "ngx_quit" may be reset by the worker thread before it's seen by a ngx_cache_manager_thread(), resulting in an infinite loop. Make sure to test ngx_exiting as well.

# Copyright (C) Igor Sysoev
# Copyright (C) Nginx, Inc.


have=NGX_SUPPRESS_WARN . auto/have

have=NGX_SMP . auto/have