Try setting CFLAGS etc on mac arm in the same way as on intel macs

Author: jobovy

.github/workflows/build.yml

@@ -264,10 +264,10 @@ jobs:
       run: |
          brew install gsl libomp
          brew info libomp
-         echo "CFLAGS=-I$(brew --prefix)/include -I/usr/local/opt/libomp/include" >> $GITHUB_ENV
-         echo "CPPFLAGS=-I$(brew --prefix)/include -I/usr/local/opt/libomp/include" >> $GITHUB_ENV
-         echo "LDFLAGS=-L$(brew --prefix)/lib -L/usr/local/opt/libomp/lib" >> $GITHUB_ENV
-         echo "LD_LIBRARY_PATH=$(brew --prefix)/lib:/usr/local/opt/libomp/lib" >> $GITHUB_ENV
+         echo "CFLAGS=-I$(brew --prefix)/include -I$(brew --prefix)/opt/libomp/include" >> $GITHUB_ENV
+         echo "CPPFLAGS=-I$(brew --prefix)/include -I$(brew --prefix)/opt/libomp/include" >> $GITHUB_ENV
+         echo "LDFLAGS=-L$(brew --prefix)/lib -L$(brew --prefix)/opt/libomp/lib" >> $GITHUB_ENV
+         echo "LD_LIBRARY_PATH=$(brew --prefix)/lib:$(brew --prefix)/opt/libomp/lib" >> $GITHUB_ENV
     - uses: actions/cache@v4
       with:
         path: ~/.cache/pip