Setupapi [3/6] : Add in-memory structures needed to implement SetupDiGetClassDevsExW in a following patch

[Hervé Poussineau]

Add in-memory structures needed to implement SetupDiGetClassDevsExW in a
following patch.
Basically, we have one list container (structure DeviceInfoSet) which will
contain multiple devices (structure DeviceInfoElement) in a chained list
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