[GHC] #14483: getExecutablePath from System.Environment in base should follow symlinks properly.

[GHC]

#14483: getExecutablePath from System.Environment in base should follow symlinks
properly.
-------------------------------------+-------------------------------------
           Reporter:  angerman       |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:  8.6.1
          Component:  Compiler       |           Version:  8.3
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 During the implementation of relocation capabilities in GHC for linux and
 macOS it came to light, that windows (which has had this support for quite
 some time), uses a custom implementation of `getExecutablePath`.

 Ideally this logic should be moved into `base`. Phyx- noted in D4121 that
 this should be possible for 8.6, as at that point Win32 should be new
 enough to be usable in base for this.

 The result would be that the custom code in GHC (SysTools) and the older
 copy in GhcPkg of the same code can be unified with the linux and macOS
 CPP conditional branch.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14483>
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