compatibility with Coq master (Coq PR 14606)

theories/typing/fixpoint.v

theories/typing/function.v

theories/typing/lib/arc.v

theories/typing/lib/cell.v

theories/typing/lib/ghostcell.v

theories/typing/lib/mutex/mutex.v

theories/typing/lib/mutex/mutexguard.v

theories/typing/lib/rc/rc.v

theories/typing/lib/rc/weak.v

theories/typing/lib/refcell/ref.v

theories/typing/lib/refcell/refcell.v

theories/typing/lib/refcell/refmut.v

theories/typing/lib/rwlock/rwlock.v

theories/typing/lib/rwlock/rwlockreadguard.v

theories/typing/lib/rwlock/rwlockwriteguard.v

theories/typing/lib/spawn.v

theories/typing/own.v

theories/typing/shr_bor.v

theories/typing/type.v

theories/typing/uniq_bor.v