disable shared and dynamic on secondary archs
    
    - this package is now arch-dependent
    - rename without_shared to ghc_without_shared and without_dynamic
      to ghc_without_dynamic so that they can be globally defined for
      secondary archs without shared libs
    - use %%undefined macro
    - disable debug_package in ghc_bin_build and ghc_lib_build
    - set ghc_without_shared and ghc_without_dynamic on secondary
      (ie non main intel archs)
    - disable debuginfo for self