The new EGL headers introduced 'EGL_NO_X11' which we could use
for ANGLE vulkan display/headless backend.

Changes in CL:

1. Updated include/EGL/egl*.h and scripts/egl.xml based on latest
   EGL repo: https://github.com/KhronosGroup/EGL-Registry
   Note: local modifications to the file were preserved in
   eglext.h, search keyword 'eglext_angle.h' for detail
2. run scripts to update entry_points/loader
   scripts/generate_entry_points.py
   scripts/generate_loader.py
   scripts/run_code_generation.py
3. Update ANGLE code on API 'eglSwapBuffersWithDamage'
4. Format with 'git cl format'

Bug: angleproject:5260
Change-Id: I70ed0dccecf0426929ef8b4775605554d66c5724
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2576314
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>