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/Makefile b/Makefile
index a6473d7..13ef54b 100644
--- a/Makefile
+++ b/Makefile
@@ -2,7 +2,7 @@
 #
 # Copyright (C) 2008  Kevin O'Connor <kevin@koconnor.net>
 #
-# 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.
 
 # Output directory
 OUT=out/