C bindings are required to build Python package (#883)

* Don't attempt to build C bindings for Python package

* Add workflow stage to do a test build of the SDist

.github/workflows/build_wheels.yml

@@ -1,6 +1,6 @@
 name: build_wheels
 
-on: 
+on:
   release:
     types: [published]
   workflow_dispatch:
@@ -35,6 +35,8 @@ jobs:
         submodules: recursive
     - name: Build SDist
       run: pipx run build --sdist
+    - name: Confirm SDist can be built
+      run: pip wheel dist/*.tar.gz
     - uses: actions/upload-artifact@v4
       with:
         name: python-sdist

pyproject.toml

@@ -45,7 +45,7 @@ sdist.exclude = [
     "oneTBB", # we may have this when we build with cibuildwheel
 ]
 wheel.packages = ["manifold3d"]
-cmake.args = ["-DMANIFOLD_PYBIND=ON", "-DMANIFOLD_PAR=TBB", "-DMANIFOLD_TEST=OFF", "-DBUILD_SHARED_LIBS=OFF"]
+cmake.args = ["-DMANIFOLD_PYBIND=ON", "-DMANIFOLD_CBIND=OFF", "-DMANIFOLD_PAR=TBB", "-DMANIFOLD_TEST=OFF", "-DBUILD_SHARED_LIBS=OFF"]
 install.components = ["bindings"]
 
 [tool.cibuildwheel]