patch applied (ghc): Fix family instance consistency check for home package modules

[chak at cse.unsw.edu.au]

Wed Dec  6 17:41:18 PST 2006  Manuel M T Chakravarty <chak at cse.unsw.edu.au>
  * Fix family instance consistency check for home package modules
  * So far, family instance modules was only available for external modules.
  * This fixes the "Over" test in the testsuite under indexed-types/

    M ./compiler/typecheck/FamInst.lhs -2 +12
    M ./compiler/typecheck/TcRnDriver.lhs +1