[GHC] #15021: ghc-pkg list crashes on Windows when unicode character is in the path

[GHC]

#15021: ghc-pkg list crashes on Windows when unicode character is in the path
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        Reporter:  nh2               |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.6.1
       Component:  ghc-pkg           |              Version:  8.2.2
      Resolution:                    |             Keywords:
Operating System:  Windows           |         Architecture:
 Type of failure:  GHC doesn't work  |  Unknown/Multiple
  at all                             |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #10762, #15096    |  Differential Rev(s):
       Wiki Page:                    |
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Changes (by nh2):

 * failure:  None/Unknown => GHC doesn't work at all
 * related:  #10762 => #10762, #15096


Comment:

 This was discovered as part of the effort to make Haskell tooling work
 well for users with non-ASCII user names:
 ​https://github.com/commercialhaskell/stack/issues/3988

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15021#comment:2>
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