(tmp, just to trigger CI)#15332
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[Why] To be able to support a mix of Erlang/OTP versions in a RabbitMQ cluster, we need to make sure that a RabbitMQ node running Erlang/OTP version N generates Khepri transaction and projection functions that can run on another node running Erlang/OTP N-1 (or older). [How] To allow that, we need to provide the assembly from the oldest runtime's compiler we support to Horus. To achieve that, the build system now fetches that oldest supported compiler based on the declared Erlang/OTP version in `rabbitmq_prelaunch/src/rabbit_prelaunch_erlang_compat.erl`; currently Erlang/OTP 26.0 as the time of this commit. This old compiler is used to compile `.erl` source files to `.S` assembly files. They are written in the `ebin` output directory. The default compiler is then used to compile the assembly files to the final `.beam` modules as usual.
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