Remove "const" from the lsearch(3) manual's synopsis too.

Reminded by Rafael Neves

src/lib/libc/stdlib/lsearch.3

@@ -1,4 +1,4 @@
-.\"	$OpenBSD: lsearch.3,v 1.10 2013/06/05 03:39:23 tedu Exp $
+.\"	$OpenBSD: lsearch.3,v 1.11 2014/07/18 07:25:26 matthew Exp $
 .\"
 .\" Copyright (c) 1989, 1991, 1993
 .\"	The Regents of the University of California.  All rights reserved.
@@ -29,7 +29,7 @@
 .\"
 .\"     @(#)lsearch.3	8.1 (Berkeley) 6/4/93
 .\"
-.Dd $Mdocdate: June 5 2013 $
+.Dd $Mdocdate: July 18 2014 $
 .Dt LSEARCH 3
 .Os
 .Sh NAME
@@ -39,7 +39,7 @@
 .Sh SYNOPSIS
 .In search.h
 .Ft char *
-.Fn lsearch "const void *key" "const void *base" "size_t *nelp" \
+.Fn lsearch "const void *key" "void *base" "size_t *nelp" \
     "size_t width" "int (*compar)(const void *, const void *)"
 .Ft char *
 .Fn lfind "const void *key" "const void *base" "size_t *nelp" \