Export missing vgcontext*.h headers and remove libvgi.mmp due to collision with KhronosRI.
EXPORTS
_ZN21RSurfaceUpdateSession12SubmitUpdateEiRK10TSurfaceIdiPK7TRegion @ 1 NONAME
_ZN21RSurfaceUpdateSession19NotifyWhenAvailableER14TRequestStatus @ 2 NONAME
_ZN21RSurfaceUpdateSession19NotifyWhenDisplayedER14TRequestStatusR8TPckgBufImE @ 3 NONAME
_ZN21RSurfaceUpdateSession25NotifyWhenDisplayedXTimesEiR14TRequestStatus @ 4 NONAME
_ZN21RSurfaceUpdateSession28CancelAllUpdateNotificationsEv @ 5 NONAME
_ZN21RSurfaceUpdateSession5CloseEv @ 6 NONAME
_ZN21RSurfaceUpdateSession7ConnectEi @ 7 NONAME
_ZN21RSurfaceUpdateSessionC1Ev @ 8 NONAME
_ZN21RSurfaceUpdateSessionC2Ev @ 9 NONAME