Fix Unicode support for SetupApi INFs

[Robert Shearman]

Hi,

A well meaning individual implemented Unicode support for SetupApi.
However, the detection for whether a file was Unicode was slightly
broken because RtlIsTextUnicode only returns true if all the flags input
were output (and NULL means all flags). Since some are contradictory
this will never return TRUE. I only set the signature detection since
heuristics will probably take a while on larger files.

Rob

Changelog:
Fix Unicode support for SetupApi INFs

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