Fix a crash that can occur when destroying a handler object that owns its

own memory (as is the case when destroying handlers in an orphaned strand).


[SVN r45811]

libs/asio

@@ -1 +1 @@
-Subproject commit ac762e87b95ef4849711a878dcb438bd8d856b66
+Subproject commit 56b93eea3a34c2c57c3092f10a93fc13d52b813e