gdi32: add test for SelectClipRgn in metafiles, make it pass (try 2)

[Dan Kegel]

Adding a simple SelectClipRgn metafile test revealed bugs in
SelectClipRgn metafile support:

- in MFDRV_CreateRegion():
   - RegionSize field, though it seemed to follow the spec, was off by
two compared to windows.  Is the spec wrong?
   - The reserved "objectCount" field didn't have the same value as on Windows

- in MFDRV_ExtSelectClipRgn, generate META_SELECTOBJECT like Windows
does, not META_SELECTCLIPREGION.

Fixing the code to pass the test also fixes bug 30923.

The patch also moves a couple misplaced test calls.

Change since first try: rediffed against current git to account for
the parts Alexandre fixed himself
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