changed code for new qse_awk_valtostr().

- fixed a bug in shorten_record() in awk/run.c
- added qse_awk_valtostrdup()
- added qse_awk_rtx_alloc ()
- added qse_awk_rtx_free ()

qse/lib/awk/std.c

@@ -1,5 +1,5 @@
 /*
- * $Id: std.c 86 2009-02-26 12:55:05Z hyunghwan.chung $
+ * $Id: std.c 89 2009-02-28 15:27:03Z hyunghwan.chung $
  *
    Copyright 2006-2009 Chung, Hyung-Hwan.
 
@@ -1268,8 +1268,7 @@ static int fnc_system (qse_awk_rtx_t* run, const qse_char_t* fnm, qse_size_t fnl
 	}
 	else
 	{
-		str = qse_awk_rtx_valtostr (
-			run, v, QSE_AWK_RTX_VALTOSTR_CLEAR, QSE_NULL, &len);
+		str = qse_awk_rtx_valtostrdup (run, v, &len);
 		if (str == QSE_NULL) return -1;
 	}