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This is the first step of adding bundled Linux kernel UAPI headers for
compatibility purposes.  These headers are going to be copied verbatim
from the Linux kernel, they are provided by the Linux kernel under the
terms of the GNU General Public License version 2 only with an explicit
syscall exception.

According to analysis made by Kent Gibson at [1], we are allowed to
re-distribute unmodified Linux kernel UAPI headers under the same terms
as they are provided by the Linux kernel, and such re-distribution does
not affect the license of strace itself.

[1] https://lore.kernel.org/linux-gpio/20210128032641.GA11655@sol/

* bundled/Makefile.am: New file.
* configure.ac (AC_CONFIG_FILES): Add bundled/Makefile.
* Makefile.am (SUBDIRS): Add bundled.
* bundled/linux/GPL-2.0: New file, copied from Linux kernel
v5.10:LICENSES/preferred/GPL-2.0 file.
* bundled/linux/Linux-syscall-note: New file, copied from Linux kernel
v5.10:LICENSES/exceptions/Linux-syscall-note file.
* bundled/linux/COPYING: New file.
* COPYING: Mention it.

Thanks-to: Kent Gibson <warthog618@gmail.com>