Older versions do not compile with GCC 15. We had different versions to test
GPLv3 exclusion.
1.21 compiles with gcc 15 and 1.20.2 has a CFLAGS tweak to allow it to work
with gcc 15 too.
1.21 is licensed under GPL-2.0 so we need to rework some of the tests.
Tweak the gplv3 test by adding a special override of LICENSE to then test
the license exclusion code.
Modify the archiver selftests to use the new version.
Based on a patch from Khem Raj <raj.khem@gmail.com>
(From OE-Core rev: 3b17355ad1ecad17d12c5eb0e6403a59ef11f7d7)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
cf9c5ac2c1