This PR fixes#13268 where `local macro` (and other local declarations)
with compound names of depth ≥ 3 would silently lose their local
entries.
When `expandNamespacedDeclaration` rewrites e.g. `local macro (name :=
A.B.C) ...` into `namespace A.B.C; end_local_scope; ...; end A.B.C`, the
compound `namespace A.B.C` pushes multiple scopes, but `end_local_scope`
only marked the topmost scope as non-delimiting. This meant
`addLocalEntry`'s stack traversal would stop at the first unmarked
scope, and the local entry would be lost when the namespace scopes were
popped.
The fix parameterizes `end_local_scope` with a depth argument so it
marks exactly the right number of scope levels as non-delimiting.
`expandNamespacedDeclaration` now passes `ns.getNumParts` as the depth,
and `expandInCmd` passes `1`.
Closes#13268
c54f691f4a