Vulcan headers issue

[Marek Mosiewicz <marek.mosiewicz@jotel.com.pl>]

Hello,

I browsed Chromium sources and I noticed Vulcan headers issue.

Vulcan is library from Khronos (http://khronos.org) - same organization
which maintains OpenGL and WebGL standards. As far as I remember OpenGL
is MIT licensed which is permissive GPL 2 compatibile license.

Unfortunetly Vulcan seems to be licensed under Apache2 license which is
GPL3 compatibile but not GPL2 compatibile.

That can be issue for Linux graphic kernel module as Linux is not
licensed under "GPL2 or later", but GPL2 only.

References
1. Vulcan headers 
https://github.com/KhronosGroup/Vulkan-Headers/blob/master/include/vulkan/vk_platform.h
2. OpenGL headers 
https://www.khronos.org/registry/OpenGL/api/GL/glext.h

Sincerly,
   Marek Mosiewicz
   htpp://marekmosiewicz.pl