Avoiding a potentially bad locking situation. ast_merge_contexts_and_delete writelocks the conlock, then

calls ast_hint_extension, which attempts to readlock the same lock. Recursion with read-write locks is 
dangerous, so the inner lock needs to be removed. I did this by copying the "guts" of ast_hint_extension
into ast_merge_contexts_and_delete (sans the extra lock).

(this change is inspired by the locking problems seen in issue #11080, but I have no idea if this is the
problematic area experienced by the reporters of that issue)



git-svn-id: http://svn.digium.com/svn/asterisk/branches/1.4@95577 f38db490-d61c-443f-a65b-d21fe96a405b

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