Libraries updates and cleanup

* Updating common/lib
 * Updating lib/csu
 * Updating lib/libc
 * Updating libexec/ld.elf_so
 * Corrected test on __minix in featuretest to actually follow the
   meaning of the comment.
 * Cleaned up _REENTRANT-related defintions.
 * Disabled -D_REENTRANT for libfetch
 * Removing some unneeded __NBSD_LIBC defines and tests

Change-Id: Ic1394baef74d11b9f86b312f5ff4bbc3cbf72ce2

lib/libc/string/bcmp.3

@@ -28,9 +28,9 @@
 .\" SUCH DAMAGE.
 .\"
 .\"     from: @(#)bcmp.3	8.1 (Berkeley) 6/4/93
-.\"	$NetBSD: bcmp.3,v 1.13 2010/04/29 06:54:26 jruoho Exp $
+.\"	$NetBSD: bcmp.3,v 1.14 2012/05/05 21:24:19 dholland Exp $
 .\"
-.Dd April 29, 2010
+.Dd May 5, 2012
 .Dt BCMP 3
 .Os
 .Sh NAME
@@ -57,6 +57,11 @@ bytes long.
 Zero-length strings are always identical.
 .Pp
 The strings may overlap.
+.Pp
+This function is obsolete.
+The equivalent function
+.Xr memcmp 3
+should be used instead.
 .Sh SEE ALSO
 .Xr memcmp 3 ,
 .Xr strcasecmp 3 ,