Add code to allow for late memory cleanup.

* common/init.c (mem_cleanup_item_t): New.
(run_mem_cleanup): New.
(_init_common_subsystems): Add an atexit for it.
(register_mem_cleanup_func): New.

* g10/kbnode.c (cleanup_registered): New.
(release_unused_nodes): New.
(alloc_node): Call register_mem_cleanup_func.
--

It is often time consuming to figure out whether still allocated
memory at process termination is fine (e.g. a cache) or a problem.  To
help for that register_mem_cleanup_func may now be used to cleanup
such memory.  The run time of the program will be longer; if that
turns out to be a problem we can change the code to only run in
debugging mode.

common/init.h

@@ -36,6 +36,8 @@
 # error GPG_ERR_SOURCE_DEFAULT has default value
 #endif
 
+void register_mem_cleanup_func (void (*func)(void));
+
 void _init_common_subsystems (gpg_err_source_t errsource,
                               int *argcp, char ***argvp);
 #define init_common_subsystems(a,b)                             \