The European Commission has approved with conditions the $17-billion acquisition by Abu Dhabi National Oil Company (ADNOC) of Germany’s chemicals giant Covestro, the EU’s executive arm said on Friday, following an investigation into foreign subsidies it feared would distort competition. At the end of last year, Abu Dhabi’s oil company agreed to buy Covestro in a deal worth $17 billion (14.7 billion euros) including debt. The deal was one of the largest cash transactions in the chemicals industry ever, as well as the first time…