patch applied (testsuite): Add a test that we get an error if conflicting mode flags are given

[Ian Lynagh]

Sat Jan 19 13:24:40 PST 2008  Ian Lynagh <igloo at earth.li>
  * Add a test that we get an error if conflicting mode flags are given

    A ./tests/ghc-regress/driver/conflicting_flags/
    A ./tests/ghc-regress/driver/conflicting_flags/Makefile
    A ./tests/ghc-regress/driver/conflicting_flags/conflicting_flags.stdout
    A ./tests/ghc-regress/driver/conflicting_flags/test.T