Replace current verbose GPL stuff in libbb/*.c with one-line GPL boilerplate.
diff --git a/libbb/fflush_stdout_and_exit.c b/libbb/fflush_stdout_and_exit.c
index cbba042..7e8152d 100644
--- a/libbb/fflush_stdout_and_exit.c
+++ b/libbb/fflush_stdout_and_exit.c
@@ -4,20 +4,7 @@
*
* Copyright (C) 2003 Manuel Novoa III <mjn3@codepoet.org>
*
- * 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.
- *
- * This program 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, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- *
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*/
/* Attempt to fflush(stdout), and exit with an error code if stdout is