Add changes file for bug11476

diff --git a/changes/bug11476 b/changes/bug11476
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+  o Bugfixes:
+    - Add configure options controlling allocator tricks like mempools and
+      freelists, and turn them off by default; on most platforms malloc is
+      reasonable enough for this not to be necessary, and a similar feature
+      in OpenSSL exacerbated Heartbleed.  Fixes bug #11476.