[GHC] #13141: Don't check for Perl in ./configure when not splitting objects

[GHC]

#13141: Don't check for Perl in ./configure when not splitting objects
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           Reporter:  dobenour       |             Owner:  dobenour
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:  8.2.1
          Component:  Compiler       |           Version:  8.0.2
           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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 GHC needs Perl for exactly two reasons:

  - To run `boot` and the Autotools
  - For the splitter

 As such, there is no reason to check for Perl in `./configure` unless
 split-objs is supported.  Even then, Perl is optional.

 The current check most likely comes from the days of the Evil Mangler.

 I'll take this.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13141>
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