Import unmodified NetBSD libc in trunk

This patch imports the unmodified current version of NetBSD libc.
The NetBSD includes are in /nbsd_include, while the libc code itself is 
split between lib/nbsd_libc and common/lib/libc.

lib/nbsd_libc/string/Lint_strncpy.c

@@ -0,0 +1,18 @@
+/*	$NetBSD: Lint_strncpy.c,v 1.1 1997/12/07 00:24:58 matthias Exp $	*/
+
+/*
+ * This file placed in the public domain.
+ * Matthias Pfaller, December 5, 1997.
+ */
+
+#include <string.h>
+
+/*ARGSUSED*/
+char *
+strncpy(dst, src, n)
+	char *dst;
+	const char *src;
+	size_t n;
+{
+	return (0);
+}