* src/system.h: Include `xalloc.h'.

Remove it from the C files.
* src/files.c (output_files): Free the obstacks.
* src/lex.c (init_lex): Rename as...
(lex_init): this.
(lex_free): New.
* src/main.c (main): Use it.

src/nullable.c

@@ -26,7 +26,6 @@
 #include "system.h"
 #include "types.h"
 #include "gram.h"
-#include "xalloc.h"
 #include "nullable.h"
 
 char *nullable = NULL;