[GHC] #15688: HAVE_LIBNUMA is defined as non-zero even when libnuma does not exist

[GHC]

#15688: HAVE_LIBNUMA is defined as non-zero even when libnuma does not exist
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        Reporter:  osa1          |                Owner:  (none)
            Type:  bug           |               Status:  new
        Priority:  normal        |            Milestone:
       Component:  Build System  |              Version:  8.6.1
      Resolution:                |             Keywords:
Operating System:  Linux         |         Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown  |            Test Case:
      Blocked By:                |             Blocking:
 Related Tickets:                |  Differential Rev(s):
       Wiki Page:                |
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Comment (by bgamari):

 Can you confirm that `includes/ghcautoconf.h` also sets `HAVE_LIBNUMA` to
 0?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15688#comment:1>
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