win32 KLockFile implementation

[Ralf Habacker]

Hi,

appended is a win32 implementation of the KLockFile class. using the 
recent KLockfile api. 

The implementation uses CreateFile() without shared access rights  to 
detect if the specific file is opened by another process. Stale lock 
file handling is also implemented.

I've also added a second KLockFile instance to testLock() of the 
testcase to check if locking really works.

If there are no objectivies I would check this in and would
- rename the recent klockfile.cpp to klockfile_unix.cpp and
- remove all win32 stuff from the unix only file.

Ralf





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