shlwapi: expose the IStream_Read and IStream_Write functions.

[Reece Dunn]

The IStream_Read and IStream_Write functions in shlwapi are available
in the Platform SDK (see MSDN:
http://msdn.microsoft.com/en-us/library/bb773799(VS.85).aspx and
http://msdn.microsoft.com/en-us/library/bb773806(VS.85).aspx).

Since these methods are also defined by the COBJMACROS define when
pulling in the IStream interface definition, the SDK undefines both
IStream_Read and IStream_Write. Since those helper macros are no
longer available, the places that used them needed fixing up as well.

- Reece
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