[GHC] #10536: Clear up how to turn off dynamic linking in build.mk

[GHC]

#10536: Clear up how to turn off dynamic linking in build.mk
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        Reporter:  thomie            |                Owner:  alpmestan
            Type:  task              |               Status:  new
        Priority:  normal            |            Milestone:  8.6.1
       Component:  Build System      |              Version:  7.10.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D1021
       Wiki Page:                    |
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Comment (by alpmestan):

 The PR has been merged, this is now covered explicitly in hadrian's
 documentation.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10536#comment:10>
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