GCC build broken

[dj2]

Building with clang works correctly, GCC, not so much.

• libdawn.cpp fails to find wgpu symbols (e.g. wgpuRenderPassEncoderSetPipeline)
• Deprecated copy warning from assigning backbufferView [1] (examples 4 and 5)

1:

src/example_04/main.cc:319:25: error: implicitly-declared ‘wgpu::TextureView& wgpu::TextureView::operator=(const wgpu::TextureView&)’ is deprecated [-Werror=deprecated-copy]
  319 |       attachment.view = backbufferView;