unifdef: add missing license
The COPYING also contains a BSD-3-Clause license. The BSD-3-Clause
applies to "manual page unifdef.1 and the portability support code in
the FreeBSD subdirectory". The BSD-2-Clause applies to everything else.
Signed-off-by: Brandon Maier <brandon.maier@collins.com>
Reviewed-by: Thomas Devoogdt <thomas@devoogdt.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
Brandon Maier