mshtml: Fixed leaks in IHTMLStyleSheet::Release and IHTMLStyleSheetsCollection::Release implementations.

kernel32/tests: Added more shared memory tests, exposing MAP_PRIVATE mapping for read only mapping problem.

The address was already converted to unix in these situations, so it's
wrong to check against windows #defines.

Cocoa will bring an unowned window to the front of its level when it's clicked,
but it doesn't do that for owned windows.  The old code went out of its way to
make owned windows behave like unowned windows in this respect.  That was
exactly backward.  We wish we could control whether windows are raised on a
click.  We don't have that opportunity for unowned windows, but, by ripping
out a bunch of code, we do for owned windows.

What I care about here is that setting peFlags != 0 doesn't cause errors
either during ddraw palette creation or DIB section creation. peFlags
isn't an alpha channel, but P8 textures abuse it that way, hence the
name of the test. It probably has deeper meaning in DDSCL_NORMAL when
the X server is running in 8 bit paletteindexed mode, but I don't think
we really care about this.