Auto merge of #11549 - heycam:release-bindings, r=heycam

Generate debug and release Gecko bindings.

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This makes `generate_style_structs.py` generate bindings for both `DEBUG` and non-`DEBUG` Gecko configurations.  The corresponding generated bindings are used in geckolib based on `cfg(debug-assertions)`.

I regenerated bindings on top of Gecko master plus https://bugzilla.mozilla.org/show_bug.cgi?id=1277154 (landing soon), which tripped up the bindgen due to bitfield layout issues.

r? @emilio

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- [ ] `./mach build -d` does not report any errors
- [X] `./mach test-tidy` does not report any errors
- [ ] These changes fix #__ (github issue number if applicable).

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- [ ] There are tests for these changes OR
- [X] These changes do not require tests because they are geckolib only

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