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/softfloat/ltdf2.c

@@ -0,0 +1,24 @@
+/* $NetBSD: ltdf2.c,v 1.1 2000/06/06 08:15:06 bjh21 Exp $ */
+
+/*
+ * Written by Ben Harris, 2000.  This file is in the Public Domain.
+ */
+
+#include "softfloat-for-gcc.h"
+#include "milieu.h"
+#include "softfloat.h"
+
+#include <sys/cdefs.h>
+#if defined(LIBC_SCCS) && !defined(lint)
+__RCSID("$NetBSD: ltdf2.c,v 1.1 2000/06/06 08:15:06 bjh21 Exp $");
+#endif /* LIBC_SCCS and not lint */
+
+flag __ltdf2(float64, float64);
+
+flag
+__ltdf2(float64 a, float64 b)
+{
+
+	/* libgcc1.c says -(a < b) */
+	return -float64_lt(a, b);
+}