include: Add missing retval attribute to propget output parameters (MIDL).

[Thomas Faber]

Fixes these:
midl\oleaut32.dll : error MIDL2020 : error generating type library : LayOut failed : IBasicAudio (0x80029C83)
midl\oleaut32.dll : error MIDL2020 : error generating type library : LayOut failed : IVideoWindow (0x80029C83)
midl\oleaut32.dll : error MIDL2020 : error generating type library : LayOut failed : IBasicVideo (0x80029C83)
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