patch applied (testsuite): Accept improved error messages for some tcfail tests

[chak at cse.unsw.edu.au]

Fri Sep  7 05:52:23 PDT 2007  Manuel M T Chakravarty <chak at cse.unsw.edu.au>
  * Accept improved error messages for some tcfail tests

    M ./tests/ghc-regress/typecheck/should_fail/tcfail127.stderr -2 +3
    M ./tests/ghc-regress/typecheck/should_fail/tcfail149.stderr -2 +3
    M ./tests/ghc-regress/typecheck/should_fail/tcfail150.stderr -2 +3