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).
diff --git a/src/smm.c b/src/smm.c
index 07c2898..ac65837 100644
--- a/src/smm.c
+++ b/src/smm.c
@@ -3,7 +3,7 @@
 // Copyright (C) 2008  Kevin O'Connor <kevin@koconnor.net>
 // Copyright (C) 2006 Fabrice Bellard
 //
-// This file may be distributed under the terms of the GNU GPLv3 license.
+// This file may be distributed under the terms of the GNU LGPLv3 license.
 
 #include "pci.h" // pci_config_writel
 #include "util.h" // wbinvd