exchangev2: remove it
As discussed on the mailing list, this is incomplete and unused with little
hope of revival.
Differential Revision: https://phab.mercurial-scm.org/D11954
Dan Villiom Podlaski Christiansen <danchr@gmail.com> [Thu, 30 Dec 2021 13:25:44 +0100] rev 48525
rust: fix build errors on darwin
I'm not all _that_ versed in Rust, but I think the root cause is that
some constants are u16 rather than u32 on Darwin. I checked that the
code still compiles on the latest Ubuntu.
Differential Revision: https://phab.mercurial-scm.org/D11955