MILAN (Reuters) -A pool of banks will have to buy shares worth almost 600 million euros in Saipem after a cash call by the Italian energy services firm fell short of the 2 billion euro target it was seeking from investors to shore-up its finances. Saipem on Thursday said it sold further new shares worth just 12.4 million euros ($12.41 million) following an auction of unexercised rights, after raising an initial 1.4 billion euros, or 70% of the targeted amount. The final take-up for the cash call rises to 70.4%, leaving banks with shares worth around 592 million euros to buy, Saipem said in a s…