Cleanup of redundant/useless header file inclusion.
ISC style lint, primarily for function declarations and standalone
comments -- ie, those that appear on a line without any code, which
should be written as follows:
/*
* This is a comment.
*/
need a special cpp macro like _XPG4 defined or the name buffer would
need to be dynamically allocated based on pathconf(), which is
undesirably complicated. Instead 255 is used as a suitably sized NAME_MAX
and 1024 in place of PATH_MAX.
include stdlib.h to define NULL; BSD/OS managed to define it in
one of the other files already included, but that was not portable.
Thanks for pointing these issues out for Linux, Brian.