Prefer OpenGL over OpenGL ES

[valaphee]

Is your feature request related to a problem? Please describe.
While working with features which are only present on OpenGL, but not ES, I wondered why OpenGL ES was used on my desktop PC. This also seems to only be the case on Linux, as on Windows OpenGL is used.

After looking up how OpenGL profiles work, I found that egl.bind_api(khronos_egl::OPENGL_ES_API).unwrap(); in https://github.com/gfx-rs/wgpu/blob/trunk/wgpu-hal/src/gles/egl.rs#L529 is called.

Describe the solution you'd like
Changing khronos_egl::OPENGL_ES_API to khronos_egl::OPENGL_API. But I don't know if there are any implications with it. According to the documentation if this operation fails the rendering api will not be changed. (therefore the default OPENGL_ES_API will be used)

Describe alternatives you've considered

Additional context