llama.cpp b9897 release renames SYCL env vars and updates binaries

The llama.cpp project has released version b9897, which includes a rename of environment variables from "disable" to "enable" for SYCL support. This update provides new binaries across multiple platforms and hardware accelerators.

• macOS Apple Silicon (arm64) and Intel (x64) builds are available.
• iOS XCFramework is included in the release.
• Linux binaries cover Ubuntu x64, arm64, s390x, Vulkan, ROCm 7.2, OpenVINO, and SYCL FP32/FP16.
• Android arm64 (CPU) builds are provided.
• Windows binaries support CPU, OpenCL Adreno, CUDA 12/13, Vulkan, OpenVINO, SYCL, and HIP.
• openEuler builds for x86 and aarch64 with ACL Graph are included.

The release ensures compatibility across diverse hardware architectures while standardizing the configuration interface for SYCL devices.