patch applied (ghc): Added support for parallel builds

[Sven Panne]

Thu Mar 15 05:24:57 PDT 2007  sven.panne at aedion.de
  * Added support for parallel builds
  
  With this patch, one can define the degree of build parallelism via a 'jobs'
  rpm variable. A comfortable way to use this is having a ~/.rpmmacros file with
  a line like:
  
     %jobs 2
  
  Alternatively, one could use a '--define "jobs 2"' command line flag for
  rpmbuild. On a Core 2 Duo using 2 jobs brings down the time for a full build
  including extralibs from 36m to 27m. If 'jobs' is not defined, a normal
  sequential build is done, following the usual conventions on e.g. openSUSE.

    M ./ghc.spec.in -1 +1