Issue #2568247 by heddn, anavarre, gapple, mstrelan, Cottser, dawehner,...

Issue #2568247 by heddn, anavarre, gapple, mstrelan, Cottser, dawehner, joelpittet, alexpott, hoff331: Remove the Twig C extension requirement as it needs to be proven it's still relevant for modern PHP versions

(cherry picked from commit fb8cdd46)