The previous implementation used the resume_handle parameter to return a pointer to the active enumeration context, but resume_handle is a DWORD. To support 64 bit pointers, the enumeration context is inserted into a global linked list and given a unique 32 bit value as identifier for later lookup.
The way the function is implemented, leaking a data structure while the MSDN description does not indicate that, seems a little questionable in general, but that is something that I leave to the original author to investigate.
NETAPI32: Get rid of the old WINE NetServerGetInfo and replace it by a proper call to NetrServerGetInfo.
SRVSVC: Implement parts of NetrServerGetInfo.
srvsvc.idl: Hack around a bug in midl or rpcrt4. They are not able to handle a pointer to a union of pointers to structs. A pointer to a union of structs works a advertised.