minimal plan9port to cross-build Jehanne

lib/lib9/fmt/errfmt.c

@@ -0,0 +1,16 @@
+/* Copyright (c) 2002-2006 Lucent Technologies; see LICENSE */
+#include <stdarg.h>
+#include <errno.h>
+#include <string.h>
+#include "plan9.h"
+#include "fmt.h"
+#include "fmtdef.h"
+
+int
+__errfmt(Fmt *f)
+{
+	char *s;
+
+	s = strerror(errno);
+	return fmtstrcpy(f, s);
+}