Heavily based on revision 40f9a89a from Simon Arlott's tree.
Bugzilla 97.
+PP/04 Use .dylib instead of .so for dynamic library loading on MacOS.
+
+PP/05 Variable $av_failed, true if the AV scanner deferred.
+ Patch from John Horne.
+ Bugzilla 1078.
+
Exim version 4.76
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