bug#41596: [staging] 'librsvg-next' build failure

[Marius Bakke <marius@gnu.org>]

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On the 'staging' branch, "librsvg-next" (a dependency of GNOME) fails to
compile the 'xml-rs' Rust crate:

--8<---------------cut here---------------start------------->8---
   Compiling xml-rs v0.8.1
error[E0658]: `cfg(doctest)` is experimental and subject to change
 --> /tmp/guix-build-librsvg-2.46.4.drv-0/librsvg-2.46.4/vendor/rust-xml-rs-0.8.1.tar.gz/src/lib.rs:9:7
  |
9 | #[cfg(doctest)]
  |       ^^^^^^^
  |
  = note: for more information, see https://github.com/rust-lang/rust/issues/62210

error[E0658]: `cfg(doctest)` is experimental and subject to change
  --> /tmp/guix-build-librsvg-2.46.4.drv-0/librsvg-2.46.4/vendor/rust-xml-rs-0.8.1.tar.gz/src/lib.rs:13:7
   |
13 | #[cfg(doctest)]
   |       ^^^^^^^
   |
   = note: for more information, see https://github.com/rust-lang/rust/issues/62210

   Compiling downcast-rs v1.1.1
   Compiling rand_core v0.3.1
   Compiling rand_jitter v0.1.4
error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0658`.
error: could not compile `xml-rs`.
warning: build failed, waiting for other jobs to finish...
error: build failed
--8<---------------cut here---------------end--------------->8---

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