patch applied (ghc): Use test -f rather than test -e, for portability (Solaris)

[Ian Lynagh]

Wed Sep 24 05:08:40 PDT 2008  Ian Lynagh <igloo at earth.li>
  * Use test -f rather than test -e, for portability (Solaris)

    M ./libraries/Makefile -1 +1
    M ./mk/bindist.mk -1 +1
    M ./mk/cabal-flags.mk -1 +1

View patch online:
http://darcs.haskell.org/ghc/_darcs/patches/20080924120840-3fd76-84213f76d95a5bb835e7c16292c30fe4f824caa9.gz