include/ddk: ntddcdvd.h structure naming, packing fixes (try 2)

[Dan Kegel]

Bring some of the definitions in wine's ntddcdvd.h header in line with WDK 7.1.
- pack all structs (see http://bugs.winehq.org/show_bug.cgi?id=26459 )
- omit leading _ in struct _DVD_READ_STRUCTURE
- omit final padding member in DVD_LAYER_DESCRIPTOR

Change since first version:
 - leave _DVD_COPY_PROTECT_KEY alone; the zero-size member provided
   by WDK is not portable, and size of structs with variable-length
   final members probably isn't crucial
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