Check applicability of closures.preproc MC to avoid dumb model copying
Without explicit dependency to the closures language, typesystem can't find TypeOf rule for ClosureLiteral.
Used to work prior to closures.preproc turned off because after each minor step model imports are recalculated and updated.
Once preproc step gone and closures.main was the first one, only explicitly imported languages were considered, and checked for typesystem rules.
Regenerated after cherry-pick from 3.0/artem (applicability of closures.preproc MC)