New additions/bug fixes required/found when porting perf.

New functions:
	tfind
	tsearch
	tdelete
	twalk
	tdestroy (GNU extension)

Bug fix: the current implementation for realpath would crash
	if the second argument (resolved_path) is NULL.

New headers:
	ar.h
	search.h

Change-Id: Ib6c1e42fc186a6d597a6e5a9692b16acaa155804
8 files changed