widl: Make the attrs parameter passed to start_typelib const.

tools/widl/typelib.c

@@ -241,7 +241,7 @@ unsigned short get_type_vt(type_t *t)
   return 0;
 }
 
-void start_typelib(char *name, attr_list_t *attrs)
+void start_typelib(char *name, const attr_list_t *attrs)
 {
     in_typelib++;
     if (!do_typelib) return;

tools/widl/typelib.h

@@ -22,7 +22,7 @@
 #define __WIDL_TYPELIB_H
 
 extern int in_typelib;
-extern void start_typelib(char *name, attr_list_t *attrs);
+extern void start_typelib(char *name, const attr_list_t *attrs);
 extern void end_typelib(void);
 extern void add_typelib_entry(type_t *t);
 extern void add_importlib(const char *name);

tools/widl/widltypes.h

@@ -307,7 +307,7 @@ struct _importlib_t {
 struct _typelib_t {
     char *name;
     char *filename;
-    attr_list_t *attrs;
+    const attr_list_t *attrs;
     struct list entries;
     struct list importlibs;
 };