ci: disable GGML_NATIVE for cross-compiled darwin x86_64 (#10)

Building on macos-latest (arm64) with CMAKE_OSX_ARCHITECTURES=x86_64
causes ggml's native arch detection to pass -march=native with the
host CPU (apple-m3), which Apple clang rejects for an x86_64 target.
Set GGML_NATIVE=OFF so ggml emits a generic x86_64 build — also more
appropriate for a release artifact than host-tuned codegen.

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: PABannier

.github/workflows/release.yml

@@ -23,7 +23,7 @@ jobs:
           - name: macOS x86_64
             os: macos-latest
             artifact: sam3-darwin-x86_64
-            cmake_args: "-DGGML_METAL=OFF -DSAM3_METAL=OFF -DBUILD_SHARED_LIBS=OFF -DCMAKE_OSX_ARCHITECTURES=x86_64"
+            cmake_args: "-DGGML_METAL=OFF -DSAM3_METAL=OFF -DBUILD_SHARED_LIBS=OFF -DCMAKE_OSX_ARCHITECTURES=x86_64 -DGGML_NATIVE=OFF"
             build_args: ""
             ext: tar.gz