[Includes] shtypes.idl: Add PERCEIVED types and flags.

[carlo.bramix at libero.it]

The attached patch adds the PERCEIVED enum type and the PERCEIVEDFLAGS 
constants to shtypes.idl
This fix is a required addition before resolving bug #23421.

Description with values for PERCEIVED enum type:
http://msdn.microsoft.com/en-us/library/windows/desktop/bb762520%28v=vs.85%29.
aspx

Description with values for PERCEIVEDFLAG constants:
http://msdn.microsoft.com/en-us/library/windows/desktop/bb773463%28v=vs.85%29.
aspx

Sincerely,

Carlo Bramini.
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