- Backported Java recursion limit fixes from p10 (Fixes: CVE-2024-7254),
  but with fixes in UnknownFieldSetLite instead of UnknownFieldSchema and
  without the fixes in ArrayDecoders. (Both things appeared in the source
  later than 3.6.1. However, the corresponding tests have been backported
  in LiteTest: they detect the problem/verify a fix.)
- %check: also run conformance tests (only for C++).

- Build this version from p10 (to have assertThrows for new protobuf tests)
  by just adapting build options in spec-file that aren't understood in the p9
  environment: no -Dmaven.compiler.release, write 1.8 in -DjdkVersion=8.

- Added hasCauseThat() method (patch).
- Added actual() method (patch).
- Added hasMessageThat() method (patch).
- Added isSameInstance() method (patch).

- Patched a little for junit-4.13: added the missing overrides for 2 new methods

- Patched its tests (a tiny bit) for junit >= 4.13. (A slightly different
  message was expected in the test, and it failed.)