[Pkg-rust-maintainers] Bug#1040837: rust-log situation update.

[Peter Green]

A bunch of packages just cleared new, and I made a bunch of follow up uploads.
The result is that the situation surrounding the log package has improved
a bit, but it still less than ideal.

The "kv_unstable" and "kv_unstable_sval" features are now enabled, the
"kv_unstable_serde" feature is currently disabled because it requires
the serde feature in the value-bag package, which in turn requires the
serde1 feature in the value-bag-serde1 crate, which in turn requires the
sval_serde crate which is not currently in debian.

I belive the net result of this is that

* kv-log-macro's binary dependencies are  satisfiable but it's build-dependencies are not.
* femme's dependencies and build-dependencies are still unsatisfiable.

Looking in the debcargo-conf repository it seems that Fabian Grünbichler
has made a start on packaging sval_serde.

Fabian: is sval-serde ready for sponsorship? if so can you add the RFS
file?