Oops! Re-release of 4.68

Sorry folks, I forgot to change the version number inside Exim from 
4.68-dev to 4.68. I have re-released it. The new MD5 hashes are

b93beb5b5cc57e428d98bd330591e9fd  exim-4.68.tar.gz
94c46a8bc24b3ad4ad892228449f378b  exim-4.68.tar.bz2

Philip

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Philip Hazel, University of Cambridge Computing Service.