macOS KleidiAI support disabled in llama.cpp update

The latest update to ggml-org/llama.cpp, as detailed in its GitHub release notes, addresses deprecation warnings from the macOS 27 SDK. Notably, support for macOS Apple Silicon with KleidiAI enabled has been disabled. This change impacts operators relying on KleidiAI functionality on macOS Apple Silicon systems, as this specific configuration is no longer supported.

Operators should verify whether their workflows depend on KleidiAI-enabled macOS Apple Silicon environments before upgrading. If such dependencies exist, alternative configurations or systems may need to be considered. Additionally, this removal aligns with a broader pattern where projects adjust compatibility to match evolving SDK requirements, often leading to the deprecation of less commonly used features.