[GHC] #8172: Expose CWD and import search paths in GHCi via new `:show paths` command

[GHC]

#8172: Expose CWD and import search paths in GHCi via new `:show paths` command
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        Reporter:  hvr               |         Owner:  hvr
            Type:  feature request   |        Status:  closed
        Priority:  normal            |     Milestone:  7.8.1
       Component:  GHCi              |       Version:  7.7
      Resolution:  fixed             |      Keywords:
Operating System:  Unknown/Multiple  |  Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown      |     Test Case:
      Blocked By:                    |      Blocking:
 Related Tickets:                    |
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Comment (by Thomas Miedema <thomasmiedema@…>):

 In [changeset:"da84fd5475d189c39bd3e12d29f45618c92ed800/ghc"]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="da84fd5475d189c39bd3e12d29f45618c92ed800"
 Testsuite Windows: fix T8172 (#8172)

 Use the new function `normalise_drive_letter` to change D:\ to C:\
 before comparing outputs.
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8172#comment:7>
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