patch applied (ghc): Don't use regexps in the GHC sources

[Ian Lynagh]

Tue Apr 10 14:56:47 PDT 2007  Ian Lynagh <igloo at earth.li>
  * Don't use regexps in the GHC sources
  3 small regexps were responsible for pulling 3 packages into core-packages.
  
  The new code should also do a better job of hiding
  "call-clobbered register used" warnings.

    M ./compiler/Makefile -10
    M ./compiler/main/SysTools.lhs -21 +77