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/stdlib/Makefile.inc

@@ -1,5 +1,5 @@
-#	$NetBSD: Makefile.inc,v 1.2 2006/03/11 21:07:18 christos Exp $
+#	$NetBSD: Makefile.inc,v 1.3 2012/04/20 17:31:30 christos Exp $
 
 .PATH: ${COMPATDIR}/stdlib
 CPPFLAGS+=-I${COMPATDIR}/stdlib -I${COMPATDIR}/../stdlib
-SRCS+=compat_unsetenv.c 
+SRCS+=compat_putenv.c compat_unsetenv.c

lib/libc/compat/stdlib/compat_putenv.c

@@ -0,0 +1,84 @@
+/*	$NetBSD: compat_putenv.c,v 1.2 2012/04/22 15:55:41 christos Exp $	*/
+
+/*-
+ * Copyright (c) 2012 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Christos Zoulas.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+#include <sys/cdefs.h>
+#if defined(LIBC_SCCS) && !defined(lint)
+__RCSID("$NetBSD: compat_putenv.c,v 1.2 2012/04/22 15:55:41 christos Exp $");
+#endif /* LIBC_SCCS and not lint */
+
+#define __LIBC12_SOURCE__
+#include "namespace.h"
+
+#include <assert.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+#include <compat/include/stdlib.h>
+
+#include "env.h"
+#include "reentrant.h"
+#include "local.h"
+
+#ifdef __weak_alias
+__weak_alias(putenv,_putenv)
+#endif
+
+__warn_references(putenv,
+    "warning: reference to compatibility putenv();"
+    " include <stdlib.h> for correct reference")
+
+/*
+ * putenv(name) --
+ *	This version implicitly copies the string for compatibility.
+ */
+int
+putenv(char *name)
+{
+	size_t l_name;
+	char *copy;
+	int rv;
+
+	_DIAGASSERT(name != NULL);
+
+        l_name = __envvarnamelen(name, true); 
+        if (l_name == 0) { 
+                errno = EINVAL;
+                return -1;
+        }
+
+	if ((copy = strdup(name)) == NULL)
+		return -1;
+	copy[l_name++] = '\0';
+
+	rv = setenv(copy, copy + l_name, 1);
+
+	free(copy);
+	return rv;
+}