b10092

<details open>

ggml: enable PowerPC backend variants on AIX (#25983)

* ggml: enable PowerPC backend variants on AIX

Allow the PowerPC CPU backend variants to be built on AIX by extending the platform check in the CMake configuration. This reuses the existing PowerPC backend implementations without changing their behavior.

Also fix a missing semicolon in the PowerPC Q0 matmul implementation.

* Fix missing semicolon in sgemm.cpp

</details>

**Website:**
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**macOS/iOS:**
- [macOS Apple Silicon (arm64)](https://github.com/ggml-org/llama.cpp/releases/download/b10092/llama-b10092-bin-macos-arm64.tar.gz)
- macOS Apple Silicon (arm64, KleidiAI enabled) [DISABLED](https://github.com/ggml-org/llama.cpp/pull/23780)
- [macOS Intel (x64)](https://github.com/ggml-org/llama.cpp/releases/download/b10092/llama-b10092-bin-macos-x64.tar.gz)
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**Linux:**
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- [Ubuntu arm64 (Vulkan)](https://github.com/ggml-org/llama.cpp/releases/download/b10092/llama-b10092-bin-ubuntu-vulkan-arm64.tar.gz)
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**Android:**
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**Windows:**
- [Windows x64 (CPU)](https://github.com/ggml-org/llama.cpp/releases/download/b10092/llama-b10092-bin-win-cpu-x64.zip)
- [Windows arm64 (CPU)](https://github.com/ggml-org/llama.cpp/releases/download/b10092/llama-b10092-bin-win-cpu-arm64.zip)
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**openEuler:**
- [DISABLED](https://github.com/ggml-org/llama.cpp/pull/23705)
- openEuler x86 (310p)
- openEuler x86 (910b, ACL Graph)
- openEuler aarch64 (310p)
- openEuler aarch64 (910b, ACL Graph)

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- [UI](https://github.com/ggml-org/llama.cpp/releases/download/b10092/llama-b10092-ui.tar.gz)