rust199: update to rust version 1.99.0.
Pkgsrc changes:
* Adapt to changes in vendored crate versions.
* Version & checksum changes.
Upstream changes:
Version 1.99.0 (2026-10-01)
==========================
Language
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- [Add allow-by-default `raw_borrows_via_references` lint that
checks for references that decay immediately into raw
borrows](https://github.com/rust-lang/rust/pull/138230)
- [Extend `unconditional_panic` lint to function calls that panic
when the chunks/windows size is zero]
(https://github.com/rust-lang/rust/pull/153563)
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gokrazy-rsync: add new package gokrazy-rsync version 0.3.8
gokrazy-rsync is an rsync alternative written in Go.
To avoid potential distfile conflicts with the original rsync,
I manually specified the distfile download so it could be renamed.
(Even though pkglint doesn't like that.)
I also moved the workdir into a subdirectory in case rsync and
gokrazy-rsync ever get built at the same time (like a bulk build).