Fix some issues in change 254760 pointed out by Bruce Evans:

 - Remove excessive parenthesis
 - Use KNF continuation indentation
 - Cut down on excessive continuation lines
 - More consistent style in messages
 - Use uprintf() instead of printf()

Submitted by:	bde
Update to 2013-08-29 NetBSD libexecinfo snapshot

This adds my patch to use the kern.proc.pathname sysctl instead of
relying on procfs(5).