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/stdio/fread.3

@@ -1,4 +1,4 @@
-.\"	$NetBSD: fread.3,v 1.14 2009/01/11 02:46:29 christos Exp $
+.\"	$NetBSD: fread.3,v 1.15 2011/09/11 04:55:48 jruoho Exp $
 .\"
 .\" Copyright (c) 1990, 1991, 1993
 .\"	The Regents of the University of California.  All rights reserved.
@@ -33,7 +33,7 @@
 .\"
 .\"     @(#)fread.3	8.2 (Berkeley) 3/8/94
 .\"
-.Dd December 19, 2008
+.Dd September 11, 2011
 .Dt FREAD 3
 .Os
 .Sh NAME
@@ -76,7 +76,7 @@ Mixing
 and
 .Fn fwrite
 calls without setting the file position explicitly using
-.Fn fsetpos
+.Xr fsetpos 3
 between read and write or write and read operations will lead to unexpected
 results because of buffering the file pointer not being set to the
 expected position after each operation completes.