llama.cpp b9892 sets optimal default thread count for ppc

The llama.cpp project has released version b9892, which includes a change to set the optimal default thread count for PowerPC (ppc) systems on both Linux and AIX.

• macOS Apple Silicon (arm64) binaries are available.
• macOS Intel (x64) binaries are provided.
• iOS XCFramework is included in the release.
• Ubuntu builds cover x64, arm64, and s390x CPU architectures.
• Vulkan support is added for Ubuntu x64 and arm64.
• ROCm 7.2 support is available for Ubuntu x64.
• OpenVINO 2026.2.1 builds are provided for Ubuntu and Windows x64.
• SYCL FP32 and FP16 builds are included for Ubuntu x64.
• Android arm64 CPU binaries are released.
• Windows builds cover CPU, OpenCL Adreno, CUDA 12/13, Vulkan, OpenVINO, SYCL, and HIP.
• openEuler support is limited to specific hardware configurations like 310p and 910b with ACL Graph.