setupapi: Add a check of "#" for interface`s subkey names

[Alexander Morozov]

In a registry of Windows XP SP2 in keys like 
HKLM\System\CurrentControlSet\Control\DeviceClasses\{GUID}\##?#ROOT#dev#ref#{GUID} 
there are not only subkeys like "#interface" but subkey "Control", which name 
is not beginning from "#". In Windows such subkeys are not being enumerated 
while enumerating interfaces. Enumerating subkey "Control" results in 
creating subkey "#ontrol" in Wine registry.

Changelog:
    Added a check of "#" for interface`s subkey names
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