[Setuapi] implement SetupDiCreateDeviceInfoListExW

[Juan Lang]

Hi Christian, thanks for working on setupapi, it could use some help.  Huw
already commnented on your patch, I have a couple more:

+    if (!list) {
+        goto cleanup;
+    }

The style in this file has opening braces on lines of their own, e.g.:
     if (hInf == INVALID_HANDLE_VALUE)
     {
         return FALSE;
     }
Please stick with that.

+    if (MachineName != NULL) {

You should probably just fail if the machine name isn't NULL, since you
don't use it and you don't connect to a remote machine anyway.

--Juan

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