server: fix file locking

[Vitaly Lipatov]

Fix some incorrect behaviour with LockFile on read only opened file.
See also
http://wiki.winehq.org/FileLocking
incorrect situation marked as X. Test suite will be published later.

Changelog:
make correct unix lock if file is opened read only

-- 
Vitaly Lipatov, ALT Linux Team
Russia, Saint-Petersburg, www.etersoft.ru
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