[meta] Gecko integration tracking

[kvark]

This is a tracker for ecosystem issues associated with integrating wgpu into Gecko. It doesn't include issues within Gecko codebase. See https://phabricator.services.mozilla.com/D49458

Architecture

• IPC: remote: handle IPC on Windows #146
• multi-client: Remote multi-process support #354

CI breakage

Linux:

• Don't depend on gfx-auxil #371

macOS:

• Switch to cc builds SSheldon/rust-objc-exception#5
• Build Metal shaders in Makefile instead of build.rs gfx#3047

Windows:

• Try to fix CI when exceptions are disabled grovesNL/spirv_cross#116
• [0.4/dx12] update d3d12 to 0.3 and use explicit linking gfx#3069
• [0.4/dx11] explicit library loading gfx#3076
• Detect clang cl driver mode rust-lang/cc-rs#455

Android:

• Avoid including stdexcept in no-exception environment KhronosGroup/SPIRV-Cross#1193

Dependency bloat

SPIRV-Cross tests: https://github.com/gfx-rs/SPIRV-Cross-Minimal

• arrayvec-0.4 removal:
  • Publish patched crossbeam-epoch without arrayvec dependency crossbeam-rs/crossbeam#446
  • Publish a patch that depends on arrayvec-0.5 oconnor663/blake2_simd#16
  • Update arrayvec dependency to 0.5 servo/uluru#11

[kvark]

This happened 🎉