glibc: correct license

The license per [1] is LGPL-2.1-or-later and
[2] converted last LGPL-2.1-only references.

License-Update: corrected from LGPL-2.1-only to LGPL-2.1-or-later based on [1] and [2]

[1] https://www.gnu.org/software/libc/
[2] https://sourceware.org/git/?p=glibc.git;a=commitdiff;h=273a835fe7c685cc54266bb8b502787bad5e9bae



Signed-off-by: Peter Marko <peter.marko@siemens.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit b7ad15a5)
Signed-off-by: Steve Sakoman <steve@sakoman.com>