[gcc r13-2529] libstdc++: Add missing runtime exception to licence notice

[Jonathan Wakely <redi@gcc.gnu.org>]

https://gcc.gnu.org/g:d7f282c4243e24f567b11a5cb6048a27a3df733d

commit r13-2529-gd7f282c4243e24f567b11a5cb6048a27a3df733d
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Tue Sep 6 11:58:21 2022 +0100

    libstdc++: Add missing runtime exception to licence notice
    
    This file is missing the GCC Runtime Library Exception text in the
    licence header. That is unintentional, and it should have been present.
    
    libstdc++-v3/ChangeLog:
    
            * include/std/barrier: Add missing runtime exception.

Diff:
---
 libstdc++-v3/include/std/barrier | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/libstdc++-v3/include/std/barrier b/libstdc++-v3/include/std/barrier
index 2a2650546ad..997e0a8f7ab 100644
--- a/libstdc++-v3/include/std/barrier
+++ b/libstdc++-v3/include/std/barrier
@@ -13,8 +13,13 @@
 // 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 library; see the file COPYING3.  If not see
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
 // <http://www.gnu.org/licenses/>.
 
 // This implementation is based on libcxx/include/barrier