Limit req: number of cleanup calls reduced. Doing a cleanup before every lookup seems to be too aggressive. It can lead to premature removal of the nodes still usable, which increases the amount of work under a mutex lock and therefore decreases performance. In order to improve cleanup behavior, cleanup function call has been moved right before the allocation of a new node.

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


cat << END >> $NGX_AUTO_CONFIG_H

#ifndef $have
#define $have  $value
#endif

END