Revert 416899fc8e

That commit neither helps without a working bind-mount implementation nor is needed when such implementation exists.

Testing shows that containerd can properly download and unpack image using bindfs mounts (see previous commit) even without Darwin-specific applier code.

Signed-off-by: Marat Radchenko <marat@slonopotamus.org>

diff/apply/apply_other.go

@@ -1,4 +1,4 @@
-//go:build !linux && !darwin
+//go:build !linux
 
 /*
    Copyright The containerd Authors.