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/arch/arm/sys/__aeabi_read_tp.S

@@ -0,0 +1,13 @@
+#include "SYS.h"
+
+ENTRY(__aeabi_read_tp)
+	mrc p15, 0, r0, c13, c0, 3
+#ifndef _ARM_ARCH_6
+	cmp r0, #0			/* was it zero? */
+	RETc(ne)			/* return it's not zero */
+	push {r1}			/* syscall zeroes r1 */
+	SYSTRAP(_lwp_getprivate)	/* can't fail */
+	pop {r1}			/* restore r1 */
+#endif
+	RET
+_END(__aeabi_read_tp)

lib/libc/arch/arm/sys/brk.S

@@ -1,4 +1,4 @@
-/*	$NetBSD: brk.S,v 1.8 2004/08/21 11:30:17 rearnsha Exp $	*/
+/*	$NetBSD: brk.S,v 1.9 2011/05/13 23:14:36 nonaka Exp $	*/
 
 /*-
  * Copyright (c) 1990 The Regents of the University of California.
@@ -33,7 +33,7 @@
 
 #include "SYS.h"
 
-	.globl	_C_LABEL(end)
+	.globl	_C_LABEL(_end)
 	.globl	CURBRK
 
 #ifdef WEAK_ALIAS
@@ -45,7 +45,7 @@ WEAK_ALIAS(brk, _brk)
 	.globl	_C_LABEL(__minbrk)
 	.type	_C_LABEL(__minbrk),#object
 _C_LABEL(__minbrk):
-	.word	_C_LABEL(end)
+	.word	_C_LABEL(_end)
 
 /*
  * Change the data segment size

lib/libc/arch/arm/sys/cerror.S

@@ -1,4 +1,4 @@
-/*	$NetBSD: cerror.S,v 1.7 2011/01/14 06:12:17 matt Exp $	*/
+/*	$NetBSD: cerror.S,v 1.8 2012/02/27 12:26:21 joerg Exp $	*/
 
 /*-
  * Copyright (c) 1990 The Regents of the University of California.
@@ -34,7 +34,7 @@
 #include "SYS.h"
 
 #ifdef PIC
-	.hidden	CERROR
+	.protected	CERROR
 #endif
 
 ASENTRY(CERROR)

lib/libc/arch/arm/sys/sbrk.S

@@ -1,4 +1,4 @@
-/*	$NetBSD: sbrk.S,v 1.8 2004/08/21 11:30:17 rearnsha Exp $	*/
+/*	$NetBSD: sbrk.S,v 1.9 2011/05/13 23:14:36 nonaka Exp $	*/
 
 /*-
  * Copyright (c) 1990 The Regents of the University of California.
@@ -33,7 +33,7 @@
 
 #include "SYS.h"
 
-	.globl	_C_LABEL(end)
+	.globl	_C_LABEL(_end)
 
 #ifdef WEAK_ALIAS
 WEAK_ALIAS(sbrk, _sbrk)
@@ -44,7 +44,7 @@ WEAK_ALIAS(sbrk, _sbrk)
 	.globl	CURBRK
 	.type	CURBRK,#object
 CURBRK:
-	.word	_C_LABEL(end)
+	.word	_C_LABEL(_end)
 
 /*
  * Change the data segment size