Change each use of fattrs' into a use of attrs_obstack'.

* src/reader.c (copy_at): Typo: s/yylloc/yyloc/.
* src/files.c (fattrs): Remove.
(attrs_obstack): New.
Adjust all dependencies.
(done): If SEMANTIC_PARSER, dump attrs_obstack into attrsfile.

src/system.h

@@ -180,3 +180,10 @@ do {						\
   sprintf (buf, Format, Arg1);			\
   obstack_grow (Obs, buf, strlen (buf));	\
 } while (0)
+
+#define obstack_fgrow2(Obs, Format, Arg1, Arg2)	\
+do {						\
+  char buf[4096];				\
+  sprintf (buf, Format, Arg1, Arg2);		\
+  obstack_grow (Obs, buf, strlen (buf));	\
+} while (0)