patch applied (ghc): Write the binary cache file atomically

[Simon Marlow]

Tue Feb 16 05:48:41 PST 2010  Simon Marlow <marlowsd at gmail.com>
  * Write the binary cache file atomically
  Should fix an occasional build error of the form 
   ghc-pkg: too few bytes. Failed reading at byte position 8

    M ./utils/ghc-pkg/Main.hs -5 +13

View patch online:
http://darcs.haskell.org/ghc/_darcs/patches/20100216134841-12142-9fa8f442cdbee9dca82b4a020470641d6f55f8cf.gz