x/sys/windows: add some missing SetupAPI functions

[xray-bit]

Proposal Details

At least the following functions are missing from the x/sys/windows package:

• SetupDiEnumDeviceInterfaces
• SetupDiGetDeviceInterfaceDetail
• SetupDiGetDeviceInterfacePropertyKeys
• SetupDiGetDeviceInterfaceProperty

I originally wanted to implement these functions myself. Before calling the SetupDiGetDeviceInterfaceDetail function, it is necessary to set the size for the size member of the windows. DevInfoData structure. However, the size member of the windows. DevInfoData structure was not exported.

[ianlancetaylor]

If these are simple Windows syscall calls, then this doesn't need to go through the proposal process.