fix: suppress License-File via setup.cfg, remove pyproject.toml entirely

pyproject.toml [project] table always conflicts with setup.py.
setup.cfg license_files= suppresses the License-File metadata field
without needing pyproject.toml at all. Release builds use --no-build-isolation
so CIBW_BEFORE_BUILD packages are visible.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: ratal

.github/workflows/ci.yml

@@ -18,7 +18,7 @@ jobs:
           python-version: ${{ matrix.python-version }}
       - name: Install dependencies
         run: |
-          pip install "setuptools>=68,<76" numpy cython lxml sympy pytest
+          pip install setuptools numpy cython lxml sympy pytest
           python setup.py build_ext --inplace
           pip install -e ".[export]"
       - name: Run tests

.github/workflows/release-linux.yml

@@ -23,6 +23,8 @@ jobs:
           CIBW_BUILD: "cp39-* cp310-* cp311-* cp312-* cp313-*"
           CIBW_MANYLINUX_X86_64_IMAGE: manylinux2014
           CIBW_MANYLINUX_AARCH64_IMAGE: manylinux2014
+          CIBW_BEFORE_BUILD: pip install setuptools numpy cython
+          CIBW_BUILD_FRONTEND: "pip; args: --no-build-isolation"
           CIBW_TEST_COMMAND: python -c "import mdfreader"
       - uses: actions/upload-artifact@v4
         with:

.github/workflows/release-macos.yml

@@ -14,6 +14,8 @@ jobs:
         env:
           CIBW_BUILD: "cp39-* cp310-* cp311-* cp312-* cp313-*"
           CIBW_ARCHS: x86_64 arm64
+          CIBW_BEFORE_BUILD: pip install setuptools numpy cython
+          CIBW_BUILD_FRONTEND: "pip; args: --no-build-isolation"
           CIBW_TEST_COMMAND: python -c "import mdfreader"
       - uses: actions/upload-artifact@v4
         with:

.github/workflows/release-windows.yml

@@ -13,6 +13,8 @@ jobs:
         uses: pypa/cibuildwheel@v2.22
         env:
           CIBW_BUILD: "cp39-win_amd64 cp310-win_amd64 cp311-win_amd64 cp312-win_amd64 cp313-win_amd64"
+          CIBW_BEFORE_BUILD: pip install setuptools numpy cython
+          CIBW_BUILD_FRONTEND: "pip; args: --no-build-isolation"
           CIBW_TEST_COMMAND: python -c "import mdfreader"
       - uses: actions/upload-artifact@v4
         with:

pyproject.toml

@@ -4,6 +4,7 @@ universal=1
 inplace=1
 [options]
 setup_requires = cython
+license_files =
 
 [tool:pytest]
 testpaths = mdfreader/tests