[GHC] #10232: versionedAppDir ignores projectVersion from DynFlags

[GHC]

#10232: versionedAppDir ignores projectVersion from DynFlags
-------------------------------------+-------------------------------------
              Reporter:  luite       |             Owner:
                  Type:  bug         |            Status:  new
              Priority:  high        |         Milestone:
             Component:  Compiler    |           Version:  7.10.1
              Keywords:              |  Operating System:  Unknown/Multiple
          Architecture:              |   Type of failure:  None/Unknown
  Unknown/Multiple                   |        Blocked By:
             Test Case:              |   Related Tickets:
              Blocking:              |
Differential Revisions:              |
-------------------------------------+-------------------------------------
 versionedAppDir uses the constant cProjectVersion rather than
 (projectVersion dflags).

 versionedAppDir was introduced after GHC 7.10 RC1 and I unfortunately
 didn't catch this before the release. This changes the location of the
 user package DB, which is now inconsistent between Cabal and GHCJS, making
 the user pkg db unusable when GHC has been compiled with 7.10.1

 Symlinking the user package db directory is a workaround, but it's only a
 partial solution since multiple GHCJS versions on the same GHC will clash.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10232>
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