Change license from GPLv3 to LGPLv3.

Change license from GPLv3 to LGPLv3.

Change license of contributions from Kevin O'Connor from GPLv3 to
LGPLv3 (or later).  Since the work as a whole is based on Kevin's
contributions and the "bochs bios" which has a license of LGPL (v2 or
later), this effectively makes the work as a whole available under
LGPLv3 (or later).