darcs patch: Pass profiling flag to ghc when compiling C files.

[Bertram Felgenhauer]

Hi folks,

this change was discussed shortly on #haskell. See also
    http://hpaste.org/fastcgi/hpaste.fcgi/view?id=11508#a11509

Regards,

Bertram

Tue Nov  3 17:55:58 CET 2009  Bertram Felgenhauer <int-e at gmx.de>
  * Pass profiling flag to ghc when compiling C files.
  The main effect of this change is that the PROFILING macro gets defined
  when compiling C files and profiling is enabled. This is useful for code
  that inspects closures.
  
  Caveat:
    The change relies on the fact that Cabal does not track dependencies
    of C files but recompiles them every time. If dependency tracking is
    added, we'll need different extensions for profiling and non-profiling
    object files.

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