Auto merge of #24176 - jdm:no-gleam, r=asajeffrey

Replace use of gleam in webgl with sparkle.

Rely on https://github.com/servo/sparkle for the GL bindings required to implement Servo's WebGL stack. This does not touch the GL usage in the compositor or webrender, which continue to rely on https://github.com/servo/gleam. This means that any breaking changes to the public GL bindings interface (such as required by https://github.com/servo/servo/pull/24111) only require updating rust-offscreen-rendering-context and rust-webvr, rather than many other crates that are out of our direct control.

---
- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [x] There are tests for these changes

<!-- Reviewable:start -->
---
This change is [<img src="https://reviewable.io/review_button.svg" height="34" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/servo/24176)
<!-- Reviewable:end -->

components/script/Cargo.toml

@@ -52,7 +52,6 @@ encoding_rs = "0.8"
 enum-iterator = "0.2.0"
 euclid = "0.20"
 fnv = "1.0"
-gleam = "0.6"
 headers = "0.2"
 html5ever = "0.23"
 http = "0.1"
@@ -100,6 +99,7 @@ servo_geometry = {path = "../geometry" }
 servo-media = {git = "https://github.com/servo/media"}
 servo_rand = {path = "../rand"}
 servo_url = {path = "../url"}
+sparkle = "0.1"
 smallvec = { version = "0.6", features = ["std", "union"] }
 style = {path = "../style", features = ["servo"]}
 style_traits = {path = "../style_traits"}

components/script/dom/webgl_extensions/extensions.rs

@@ -20,9 +20,9 @@ use crate::dom::webglrenderingcontext::WebGLRenderingContext;
 use crate::dom::webgltexture::TexCompression;
 use canvas_traits::webgl::{GlType, WebGLVersion};
 use fnv::{FnvHashMap, FnvHashSet};
-use gleam::gl::{self, GLenum};
 use js::jsapi::JSObject;
 use malloc_size_of::MallocSizeOf;
+use sparkle::gl::{self, GLenum};
 use std::collections::HashMap;
 use std::iter::FromIterator;
 use std::ptr::NonNull;