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`cargo doc` fails to build `gstreamer-gl-x11` with Rust stable

Please see https://github.com/servo/servo/issues/31109.

In Servo we are trying to build documentation (including for all dependencies) using Rust stable. It seems that gstreamer-gl-x11 does not properly build for documentation with a stable compiler:

Documenting gstreamer-gl-x11 v0.21.1
error[E0554]: `#![feature]` may not be used on the stable release channel
 --> /home/runner/.cargo/registry/src/index.crates.io-6f17d22bba15001f/gstreamer-gl-x11-0.21.1/src/lib.rs:9:37
  |
9 | #![cfg_attr(all(not(doctest), doc), feature(doc_cfg))]
  |                                     ^^^^^^^^^^^^^^^^

For more information about this error, try `rustc --explain E0554`.
error: could not document `gstreamer-gl-x11`
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