patch applied (testsuite): adapt tests to new Category superclass of Arrow

[Ross Paterson]

Tue Nov  6 02:58:49 PST 2007  Ross Paterson <ross at soi.city.ac.uk>
  * adapt tests to new Category superclass of Arrow

    M ./tests/ghc-regress/arrows/should_run/arrowrun002.hs -1 +6
    M ./tests/ghc-regress/arrows/should_run/arrowrun003.hs -5 +13
    M ./tests/ghc-regress/arrows/should_run/arrowrun004.hs -2 +7
    M ./tests/ghc-regress/gadt/arrow.hs -3 +7