[GHC] #9341: Evaluate default CPUs setting for validate

[GHC]

#9341: Evaluate default CPUs setting for validate
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        Reporter:  nomeata           |                   Owner:
            Type:  bug               |                  Status:  new
        Priority:  normal            |               Milestone:
       Component:  Build System      |                 Version:  7.8.2
        Keywords:                    |  Differential Revisions:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  None/Unknown      |  Unknown/Multiple
       Test Case:                    |              Difficulty:  Unknown
        Blocking:                    |              Blocked By:
                                     |         Related Tickets:
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 This is a fork off #9315:comment 16. `./validate` runs `-j2` (i.e.
 CPUS=1). I guess most developers these days have a stronger system that
 would allow for more cores to be used.

 This ticket should discuss if this default should changed to something
 higher, or possibly something dynamic. On Linux, there is the command
 `nproc`, part of coreutils, for that – is that also provided by our
 default windows environment?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9341>
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