Extract out version info function. The code for displaying version info and configuration info seemed to be cluttering up the main function. I was finding it hard to read main. This extracts out all of the logic for displaying version and configuration info into its own function, thus making main easier to read.

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


cat << END >> $NGX_AUTO_CONFIG_H

#ifndef $have
#define $have  1
#endif

END