wininet: Remove custom port handling in HTTP_HandleRedirect.
oleaut32: Clarify cast operation (PVS-Studio).
avifil32: Simplify comparing two unsigned ints (PVS-Studio).
wininet: Fix InternetGetConnectedStateEx[A|W].
kernel32: Set COMPUTERNAME environment variable.
gdiplus: Adjust identical conditions (PVS-Studio).
gdi32: Fix typo in a condition (PVS-Studio).
wrc: Remove duplicate code (PVS-Studio).
comdlg32: Remove duplicate code (PVS-Studio).
comdlg32: Use PathAddBackslash to avoid a compiler warning.
regedit: Append exported strings using the correct size.
winemac: Don't allow double-clicks in the content area to zoom the window.

On Yosemite, double-clicking a window's title bar zooms it.  (This is to
compensate for the fact that the zoom button has been replaced by a full-screen
button.)  Sometimes, double-clicking in the content area would count as double-
clicking in the title bar.

This is controlled, in part, by the -mouseDownCanMoveWindow method of the view
that was hit in the window.  The default implementation of that returns YES
for non-opaque views, as the views are in the Mac driver.  Overriding it to
return NO prevents the problem.
write: Always append a backslash to the system directory.
kernel32/tests: Use a pointer instead of an array to make gcc happy.