fix: debug py3.13 GHA build-with-clang segfault

Author: jharlow-intel

.github/workflows/build-with-clang.yml

@@ -70,11 +70,17 @@ jobs:
           export CFLAGS="${CFLAGS} -fno-fast-math -O2"
           pip install . --no-build-isolation --no-deps --verbose
 
+      - name: Smoke import
+        run: |
+          source ${{ env.ONEAPI_ROOT }}/setvars.sh
+          python -X faulthandler -c "import numpy, mkl_umath; print('import OK')"
+
       - name: Run mkl_umath tests
         run: |
           source ${{ env.ONEAPI_ROOT }}/setvars.sh
           pip install pytest
           # mkl_umath cannot be installed in editable mode, we need 
           # to change directory before importing it and running tests
           cd ..
+          export MKL_DISABLE_FAST_MM=1
           python -m pytest -sv --pyargs mkl_umath/mkl_umath/tests