turn off pep517

Author: fangchenli

.github/workflows/ci.yml

@@ -91,7 +91,7 @@ jobs:
           pip install --no-build-isolation classy==2.9.4
 
       - name: Install CCL
-        run: pip install .
+        run: pip install -e -no-use-pep517 .
 
       - name: Unit tests
         run: |

pyproject.toml

@@ -1,6 +1,5 @@
 [build-system]
 requires = ["setuptools>=64", "setuptools_scm>=8", "cmake", "swig"]
-build-backend = "setuptools.build_meta"
 
 [project]
 name = "pyccl"