By Ludwig Burger and Bart H. Meijer AMSTERDAM (Reuters) -Dutch specialty chemicals maker DSM struck deals to take over Swiss flavour and fragrance maker Firmenich and sell its engineering plastics division to become a major player in the fast-growing food ingredients and health products markets. Shares in DSM jumped as much as 12.6% after the company said on Tuesday that its shareholders will take 65.5% of the shares in a new group called DSM-Firmenich, while the owners of unlisted Firmenich will receive a 34.5% stake of the combined entity plus 3.5 billion euros in cash from DSM. Analysts at …