egl: Implement EGL_KHR_debug (v2)

Wire up the debug entrypoints to EGL dispatch, and add the extension
string to the client extension list.

v2:
- Lots of style fixes
- Fix missing EGLAPIENTRYs
- Factor out valid attribute check
- Lock display in eglLabelObjectKHR as needed, and use RETURN_EGL_*
- Move "EGL_KHR_debug" into asciibetical order in client extension
  string

Reviewed-by: Adam Jackson <[email protected]>
Reviewed-by: Emil Velikov <[email protected]>

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