COPYING: Now fully LGPLv2+

I ran into Jeremy Katz today, and he gave me permission to relicense
the small bits of switch-root.c to LGPLv2+.  This combined with
permission from Peter Jones allows OSTree to become fully LGPLv2+.

Not a big deal, it's just a lot clearer to only have one license, and
it makes it easier to turn application code into library code.

src/switchroot/ostree-prepare-root.c

@@ -9,19 +9,22 @@
  *	Peter Jones <pjones@redhat.com>
  *	Jeremy Katz <katzj@redhat.com>
  *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
+ * Relicensed with permission to LGPLv2+.
  *
- * This program is distributed in the hope that it will be useful,
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
  *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
  */
 
 #include "config.h"