ntdll: add WinSqmEndSession/WinSqmStartSession stubs

[Michael Müller]

Am 20.05.2016 um 06:15 schrieb Austin English:
> +NTSTATUS WINAPI WinSqmStartSession(GUID *sessionguid, DWORD sessionid, DWORD unknown1)
> +{

Your usage example indicates that the function returns a HANDLE and not
a NTSTATUS value. Returning INVALID_HANDLE_VALUE would therefore be the
most suitable value for a stub. The linked code also handles this case.

> +@ stdcall WinSqmEndSession(ptr)

The parameter is a handle, so you should mark it as long instead of ptr.
Btw, the remaining functions seems to be sorted alphabetically, so you
also might want to correctly insert this function.