remove deprecated pkg/symlink
remove deprecated pkg/symlink

This package was deprecated in dc3c382b343e45c9c84e0ac01a13e09c12e88bc7, which
was part of the 20.10 release, so consumers of this package should've been
able to migrate to the new location.

Signed-off-by: Sebastiaan van Stijn <64b2b6d12bfe4baae7dad3d018f8cbf6b0e7a044@gone.nl>

Ramzec/docker,Ramzec/docker,moul/docker,flavio/docker,bearstech/moby,trebonian/docker,flavio/docker,nalind/docker,bearstech/moby,moby/moby,vdemeester/docker,Ramzec/docker,Mokolea/docker,konstruktoid/docker-upstream,gnailuy/docker,trebonian/docker,moul/docker,moby/moby,jimjag/docker,cpuguy83/docker,Mokolea/docker,Mokolea/docker,thaJeztah/docker,nawawi/docker,nawawi/docker,bearstech/moby,thaJeztah/docker,mahak/docker,nalind/docker,nalind/docker,moby/moby,gnailuy/docker,bearstech/moby,konstruktoid/docker-upstream,konstruktoid/docker-upstream,thaJeztah/docker,trebonian/docker,gnailuy/docker,flavio/docker,cpuguy83/docker,nawawi/docker,mahak/docker,jimjag/docker,cpuguy83/docker,jimjag/docker,flavio/docker,jimjag/docker,nawawi/docker,Mokolea/docker,moul/docker,nalind/docker,mahak/docker,konstruktoid/docker-upstream,thaJeztah/docker,Ramzec/docker,mahak/docker,moby/moby,gnailuy/docker,moul/docker,vdemeester/docker,vdemeester/docker,trebonian/docker,cpuguy83/docker