[Pkg-haskell-maintainers] Patch to enable GHC runtime system with thr_debug_p options...

["Michał J. Gajda"]

Dear Haskell package maintainers,

I noticed that Ubuntu, as well as Debian and original packages come 
without some variants of threaded debugging binaries.
A recent change added of printing a stack trace with -xc option requires 
using both -ticky and profiling compile options,
which in turn forces program to be compiled in a -debug RTS way.
Since stack trace looks like indispensable debugging tool, and 
convenient parallelization is strength of Haskell,
I wonder is there any remaining reason to leave beginners with a cryptic 
error message
when they try to debug a parallel or threaded application, and want to 
take advantage of stack trace?

The resulting ghc-prof package would be increased by less than 1%.

Here is a patch for Ubuntu/Debian GHC 7.4.2 package, as well as upstream
--
   Best regards
     Michal
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