[GHC] #15667: Readonly permissions bits are wrong

[GHC]

#15667: Readonly permissions bits are wrong
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           Reporter:  Phyx-          |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  high           |         Milestone:  8.6.1
          Component:  Compiler       |           Version:  8.4.3
           Keywords:                 |  Operating System:  Windows
       Architecture:                 |   Type of failure:  GHC doesn't work
  Unknown/Multiple                   |  at all
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 Unfortunately it seems the mapping for the permission bits for GHC 8.6.1
 seem to have gotten screwed up.

 When installed to a read-only location GHC is no longer working due to it
 attempting to get write access as well.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15667>
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