In Linux + Vulkan display/headless backend, angle tests such as
angle_unittests/angle_perftests/angle_white_box_perf_tests could
not be compiled successfully, fix build issues on vulkan
display/headless backend in angle tests.

1. Add EGL_NO_X11 flag into vulkan display/headless backend.
2. Disable angle_white_box_perf_tests on vulkan display/headless
   backend.

Bug: angleproject:5260
Change-Id: I579aee8b0bfaa4c0d7fdf9a6df91c1b78ec4373e
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2585256
Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>