Add the full text of the GPL 1.0 license to the kernel tree.  It was
copied directly from:

       https://spdx.org/licenses/GPL-1.0.html#licenseTextSigned-off-by: NThomas Gleixner <tglx@linutronix.de>
Reviewed-by: NPhilippe Ombredanne <pombredanne@nexb.com>
Reviewed-by: NKate Stewart <kstewart@linuxfoundation.org>
Reviewed-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: NJonathan Corbet <corbet@lwn.net>