2009.08.14
Now compile the simple hello system call into the kernel, not as a module.
After it compiles here, this source code needs to be in the kernel source tree.
Or else make a link from the kernel source tree to this directory.

This first version, like the first module version, is a no-parameter, no-result system call;
a simple call, printk, and return. The only observable results are in /var/log/messages when
the test program is run.