[PATCH 2/3] kernel32/path : try3 implement copyfileexW progressroutine callback

[Patrick Rudolph]

This should fix bug http://bugs.winehq.org/show_bug.cgi?id=29232
It fixes lots of tests on wine.

try 2:
set progress routine pointer to NULL to disable progress reporting
test osversion and delete destination file on PROGRESS_STOP on vista 
and newer
code cleanup

try 3:
do not use os version info
added fall-trough to match win7 behavior
add warnings here instead of separate patch
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