Change lsearch()'s "base" argument to require a non-const pointer to

align with POSIX and other systems.
Pointed out by Elliott Hughes on tech
ok deraadt

src/include/search.h

@@ -1,4 +1,4 @@
-/*	$OpenBSD: search.h,v 1.9 2012/07/10 11:44:55 guenther Exp $	*/
+/*	$OpenBSD: search.h,v 1.10 2014/07/18 04:16:09 matthew Exp $	*/
 /*	$NetBSD: search.h,v 1.9 1995/08/08 21:14:45 jtc Exp $	*/
 
 /*
@@ -40,7 +40,7 @@ ENTRY	*hsearch(ENTRY, ACTION);
 
 void	*lfind(const void *, const void *, size_t *, size_t,
 	    int (*)(const void *, const void *));
-void	*lsearch(const void *, const void *, size_t *, size_t,
+void	*lsearch(const void *, void *, size_t *, size_t,
 	    int (*)(const void *, const void *));
 void	 insque(void *, void *);
 void	 remque(void *);

src/lib/libc/stdlib/lsearch.c

@@ -1,4 +1,4 @@
-/*	$OpenBSD: lsearch.c,v 1.4 2009/10/27 23:59:59 deraadt Exp $	*/
+/*	$OpenBSD: lsearch.c,v 1.5 2014/07/18 04:16:09 matthew Exp $	*/
 
 /*
  * Copyright (c) 1989, 1993
@@ -41,7 +41,7 @@ static void *linear_base(const void *, const void *, size_t *, size_t,
     cmp_fn_t, int);
 
 void *
-lsearch(const void *key, const void *base, size_t *nelp, size_t width,
+lsearch(const void *key, void *base, size_t *nelp, size_t width,
     	cmp_fn_t compar)
 {