[GHC] #10093: Library configure scripts should not clobber CPPFLAGS nor LDFLAGS

[GHC]

#10093: Library configure scripts should not clobber CPPFLAGS nor LDFLAGS
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        Reporter:  PHO               |                   Owner:
            Type:  bug               |                  Status:  patch
        Priority:  normal            |               Milestone:
       Component:  Build System      |                 Version:  7.11
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  Runtime crash     |  Unknown/Multiple
      Blocked By:                    |               Test Case:
 Related Tickets:                    |                Blocking:
                                     |  Differential Revisions:  Phab:D663
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Comment (by PHO):

 Okay I submitted a code review to Phabricator. This is my first time using
 Phab so I hope I haven't made mistakes.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10093#comment:2>
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