patch applied (ghc-6.6/testsuite): Decouple mod158 from mod157 so it works in CLEANUP mode

[Ian Lynagh]

Sun Mar  4 11:24:11 PST 2007  Ian Lynagh <igloo at earth.li>
  * Decouple mod158 from mod157 so it works in CLEANUP mode

    M ./tests/ghc-regress/module/Makefile +10
    M ./tests/ghc-regress/module/all.T -1 +3
    M ./tests/ghc-regress/module/mod158.stderr +1