ralloc: Delete autofree handling.

There was exactly one user of this, and I just removed it.

It also accessed an implicit global context, with no locking.  This
meant that it was only safe if all callers of ralloc_autofree_context()
held the same lock...which is a pretty terrible thing for a utility
library to impose.

Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>

src/util/ralloc.h

@@ -246,15 +246,6 @@ void ralloc_adopt(const void *new_ctx, void *old_ctx);
  */
 void *ralloc_parent(const void *ptr);
 
-/**
- * Return a context whose memory will be automatically freed at program exit.
- *
- * The first call to this function creates a context and registers a handler
- * to free it using \c atexit.  This may cause trouble if used in a library
- * loaded with \c dlopen.
- */
-void *ralloc_autofree_context(void);
-
 /**
  * Set a callback to occur just before an object is freed.
  */