Windows and OS/2 file rename problem - [PATCH]

Hi,

On Windows (native and Cygwin) and OS/2, when running
UFSSwapDir::closeTmpSwapLog() in store_dir_ufs.cc, Squid can be fail if the
target file for a rename operation was already deleted.

Because xrename() already try to remove the destination target on Windows,
a previous unlink() is not needed.

This patch extended the native Windows xrename() behaviour to Cygwin and
OS/2 too and remove not needed unlink().

Regards

Guido

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Guido Serassio
Acme Consulting S.r.l.
Via Gorizia, 69 10136 - Torino - ITALY
Tel. : +39.011.3249426 Fax. : +39.011.3293665
Email: guido.serassio@acmeconsulting.it
WWW: http://www.acmeconsulting.it/