* 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/main.c

@@ -102,6 +102,8 @@ main (int argc, char *argv[])
   /* Free the symbol table data structure.  */
   free_symtab ();
 
+  lex_free ();
+
   /* Close the input files. */
   close_files ();