[GHC] #10550: Drop truncated package name prefix from package keys

[GHC]

#10550: Drop truncated package name prefix from package keys
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        Reporter:  ezyang            |                   Owner:  ezyang
            Type:  bug               |                  Status:  new
        Priority:  normal            |               Milestone:  7.12.1
       Component:  Package system    |                 Version:  7.11
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  None/Unknown      |  Unknown/Multiple
      Blocked By:                    |               Test Case:
 Related Tickets:                    |                Blocking:
                                     |  Differential Revisions:
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Comment (by simonpj):

 Generally ok with me, but please document in the user manual, in as many
 plausible places as possible, the use of `ghc-pkg` to decode the package
 key.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10550#comment:4>
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