[GHC] #8700: Cross-compilation perf-cross BuildFlavour

[GHC]

#8700: Cross-compilation perf-cross BuildFlavour
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       Reporter:  lukexi                   |             Owner:
           Type:  bug                      |            Status:  new
       Priority:  high                     |         Milestone:  7.8.1
      Component:  Build System             |           Version:  7.8.1-rc1
       Keywords:                           |  Operating System:
   Architecture:  Unknown/Multiple         |  Unknown/Multiple
     Difficulty:  Easy (less than 1 hour)  |   Type of failure:
     Blocked By:                           |  None/Unknown
Related Tickets:                           |         Test Case:
                                           |          Blocking:
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 Adds a perf-cross BuildFlavour to build.mk.sample in preparation for
 release-ready builds of GHC iOS cross compilers.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8700>
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