OSV-2024-1372 Bad-cast to Assimp::LogStream from Assimp::OptimizeMeshesProcess

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=383595860 Crash type: Bad-cast Crash state: Bad-cast to Assimp::LogStream from Assimp::OptimizeMeshesProcess CallbackToLogRedirector Assimp::DefaultLogger::WriteToStreams...