Add the full text of the X11 to the kernel tree. It was copied directly
from:
https://spdx.org/licenses/X11.html#licenseText
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
