patch applied (ghc-6.8/ghc): Show CmdLineError exceptions as "<command line>: ..."

[Ian Lynagh]

Wed Jan 23 08:31:45 PST 2008  Simon Marlow <simonmar at microsoft.com>
  * Show CmdLineError exceptions as "<command line>: ..."
  instead of something like "ghc-6.8.2: ...", which causes problems in
  the test suite.  In any case, "<command line>" seems a more
  appropriate context for these errors, the only question is whether
  we're using CmdLineError incorrectly anywhere.

    M ./compiler/utils/Panic.lhs +1