build|interpreter: use typed_kwargs for link_with

This replaces the long explanation of `external_library`s in the
`link_with` parameter to the simpler one used by declare_dependency.
Additionally, declare_dependency now checks that a target is linkable
when adding it. This just catches the problem before it goes down into
the build layer giving a better error message.

There is a bug in the declare_dependency annotations, in that they don't
mark Executable as acceptable. So I've fixed that.

0 files changed, 0 insertions, 0 deletions