Disable MKL on macOS CI

GitHub's macOS runners switched to using the Apple Silicon architecture,
which is not supported by Intel's MKL.

.github/workflows/ci.yml

@@ -15,20 +15,14 @@ jobs:
       uses: hecrj/setup-rust-action@v1
       with:
         rust-version: ${{ matrix.rust }}
-    - name: Install Intel MKL
-      if: matrix.os == 'macOS-latest'
-      run: |
-        sudo mkdir -p /opt/intel/mkl/lib/intel64
-        curl https://s3-ap-northeast-1.amazonaws.com/rust-intel-mkl/macos/2019.3/mkl-dynamic-lp64-seq.tar.zst | zstd -cd | sudo tar -xC /opt/intel/mkl/lib/intel64
     - uses: actions/checkout@master
     - name: Install Tarpaulin
       if: matrix.os == 'ubuntu-latest' && matrix.rust == 'stable'
       run: cargo install cargo-tarpaulin
     - name: Run tests on macOS
       if: matrix.os == 'macOS-latest'
       run: |
-        export LD_LIBRARY_PATH="/opt/intel/mkl/lib/intel64"
-        cargo test --verbose --features "intel-mkl-system, serialization"
+        cargo test --verbose --features "serialization"
     - name: Run tests
       if: matrix.os == 'ubuntu-latest' || matrix.os == 'windows-latest'
       run: cargo test --verbose --features "intel-mkl-static, serialization"

build.rs

@@ -0,0 +1,4 @@
+fn main() {
+    #[cfg(target_os = "macos")]
+    println!("cargo:rustc-link-lib=framework=Accelerate");
+}