Linux repo has under `tools/include/nolibc` very simple include files
that we can use to generate very small binaries that don't depend on
libc.
To make things even better, since Linux 6.6 it supports all the
architectures we support in runc, which is just beautiful.
The runc-dmz binary on x86_64 before this patch (on my debian host) was
taking 636K, with this patch it takes only 8K.
Signed-off-by: Rodrigo Campos <rodrigoca@microsoft.com>