[GHC] #8783: make ghc-pwd-bindist script /bin/sh compatible for Solaris

[GHC]

#8783: make ghc-pwd-bindist script /bin/sh compatible for Solaris
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        Reporter:  maeder            |            Owner:
            Type:  bug               |           Status:  new
        Priority:  normal            |        Milestone:  7.8.1
       Component:  Build System      |          Version:  7.8.1-rc2
      Resolution:                    |         Keywords:
Operating System:  Solaris           |     Architecture:  Unknown/Multiple
 Type of failure:  Building GHC      |       Difficulty:  Easy (less than 1
  failed                             |  hour)
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:
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Comment (by maeder):

 Yes, $$SHELL works, too!

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8783#comment:26>
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