fix: change export statement order

Author: yoyolicoris

.github/workflows/python-package.yml

@@ -29,8 +29,6 @@ jobs:
       if: matrix.os == 'macos-13'
       run: |
         brew install libomp
-        export CC=$(brew --prefix llvm@15)/bin/clang
-        export CXX=$(brew --prefix llvm@15)/bin/clang++
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
@@ -45,6 +43,8 @@ jobs:
         flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
     - name: Build CPP extension
       run: |
+        export CC=$(brew --prefix llvm)/bin/clang
+        export CXX=$(brew --prefix llvm)/bin/clang++
         python setup.py build
         find build/ -name "_C*.so" -exec cp {} ./torchlpc/ \;
     - name: Test with pytest