darcs patch: Fix build with external gmp library.

[gwright at antiope.com]

Mon Aug 13 08:42:11 EDT 2007  gwright at antiope.com
  * Fix build with external gmp library.
  
  ghc fails to build if you use an external gmp library. This is because
  ghc requires the header file gmp.h, which used to be provided by the
  internal gmp source code.  The file gmp.h is no longer part of the
  gmp source code, but is generated as part of the build procedure.
  If an external gmp is specified, the internal gmp is not built and the
  gmp.h file never generated.
  
  Of course, it was a bad idea anyway to use a header file from a potentially
  different version of the library.
  
  The patch sets HAVE_LIB_GMP if the gmp library is found during configuration
  and conditionalizes including the library header file on it.
  

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