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
diff --git a/libc/Android.mk b/libc/Android.mk
index 1ce2feb..5e41741 100644
--- a/libc/Android.mk
+++ b/libc/Android.mk
@@ -281,8 +281,12 @@
 	bionic/ssp.c \
 	bionic/stubs.c \
 	bionic/system_properties.c \
+	bionic/tdelete.c \
+	bionic/tdestroy.c \
 	bionic/time64.c \
+	bionic/tfind.c \
 	bionic/thread_atexit.c \
+	bionic/tsearch.c \
 	bionic/utime.c \
 	bionic/utmp.c \
 	netbsd/gethnamaddr.c \