By Saikat Chatterjee and Dhara Ranasinghe LONDON (Reuters) -The euro’s fall of as much as 4% against the dollar and Swiss franc in two weeks is raising the question of what – if anything – the European Central Bank will do about it. Euro weakness, in normal times, would be welcomed by an export-reliant bloc that has long struggled to meet a 2% inflation target. But in days of 5%-plus inflation, record energy import bills and a looming Russia-linked growth hit, it is something the policymakers cannot ignore. Given that the decline is down primarily to the diminishing likelihood of a near-term E…