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/compat/db/hash/compat_ndbmdatum.c

@@ -1,4 +1,4 @@
-/*	$NetBSD: compat_ndbmdatum.c,v 1.1 2005/09/13 01:44:09 christos Exp $	*/
+/*	$NetBSD: compat_ndbmdatum.c,v 1.2 2012/03/13 21:13:31 christos Exp $	*/
 
 /*
  * Written by Klaus Klein <kleink@NetBSD.org>, April 28, 2004.
@@ -28,4 +28,6 @@ __warn_references(dbm_store,
     " include <ndbm.h> for correct reference")
 
 #define datum datum12
+#define datum_truncate(a)	((a) > INT_MAX ? INT_MAX : (int)(a))
+
 #include "db/hash/ndbmdatum.c"