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

[Andrea Vezzosi]

Tue Mar 18 17:12:37 CET 2008  Andrea Vezzosi <sanzhiyan at 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.
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