darcs patch: fix 'clean' bug on windows caused by leaked Handle.

Tue Mar 18 17:12:37 CET 2008 Andrea Vezzosi <sanzhiyan@gmail.com> * fix 'clean' bug on windows caused by leaked Handle. Using readFile to read dist/setup-config keeps the Handle open when we try to delete the file, causing an error. So we instead read the file strictly and close the Handle early.