links to diffs on ghc-commit emails seem to be broken

[Carter Schonwald]

Hey all,
links seem to not work, though they are included in the emails

eg
from the email
[commit: ghc] master: Move AsmCodeGen.makeFarBranches to PPC.Instr (#709)
(aa1d7d3)
http://hackage.haskell.org/trac/ghc/changeset/aa1d7d35ac27625c9aa67fe71c186f79600f0201

*should* these be broken or is something needing to be fixed up?

thanks
-Carter
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