patch applied (ghc): Use </> rather than ++ "/"

[Ian Lynagh]

Thu Mar 25 06:32:37 PDT 2010  Ian Lynagh <igloo at earth.li>
  * Use </> rather than ++ "/"
  This stops us generating paths like
      c:\foo\/ghc460_0/ghc460_0.o
  which windres doesn't understand.

    M ./compiler/main/SysTools.lhs -1 +1