OSLO (Reuters) - Norway's Equinor has suspended its ongoing $5 billion share buyback programme due to the coronavirus outbreak and the crash in oil prices, the company said on Sunday.The European oil major was planning to execute the second tranche of its plan - worth $675 million when including the Norwegian state's share - between May 18 and Oct. 28.The overall programme was due to run until 2022. "Equinor is under the current market conditions suspending buy-back under the share buy-back..