Windows: Assistant now logs to daemon.log.

Yes, this means that git annex webapp on windows execs git-annex, which
execs itself to set env, and the execs itself again to redirect logs.

This is disgusting. This is Windows(TM).

Utility/LogFile.hs

@@ -15,13 +15,10 @@ import Common
 import System.Posix.Types
 #endif
 
-#ifndef mingw32_HOST_OS
-openLog :: FilePath -> IO Fd
+openLog :: FilePath -> IO Handle
 openLog logfile = do
 	rotateLog logfile
-	openFd logfile WriteOnly (Just stdFileMode)
-		defaultFileFlags { append = True }
-#endif
+	openFile logfile AppendMode
 
 rotateLog :: FilePath -> IO ()
 rotateLog logfile = go 0