Outré horror maestro Peter Strickland is back. The filmmaker behind such Eurotica, vintage, throwback classics such as “Berberian Sound Studio” (2012), “The Duke of Burgundy” (2014), and “In Fabric” (2018), returns to the Berlin Film Festival this week (today, in fact), with his latest deliciously bizarro offering, “Flux Gourmet.” The premise? Something like beef within the culinary/sonic art collective world and a whole set of egos and intestinal issues.