Try dropping build dependency stuff.

Author: matthew-brett

.github/workflows/build.ps1

@@ -1,9 +1,7 @@
 echo "::group::Build wheel"
   $wheel_sdir = "wheelhouse"
   pip install tomli
-  $build_dep = python .\print_deps.py $env:MB_PYTHON_VERSION ${env:REPO_DIR}
-  pip install @($build_dep.split())
-  pip wheel -w "${wheel_sdir}" --no-build-isolation ".\${env:REPO_DIR}"
+  pip wheel -w "${wheel_sdir}" --no-deps ".\${env:REPO_DIR}"
   ls -l "${env:GITHUB_WORKSPACE}/${wheel_sdir}/"
 echo "::endgroup::"
 

.github/workflows/build.sh

@@ -17,14 +17,12 @@ echo "::group::Install a virtualenv"
   source multibuild/common_utils.sh
   source multibuild/travis_steps.sh
   python3 -m pip install virtualenv tomli
-  export BUILD_DEPENDS=$(python3 ./print_deps.py ${MB_PYTHON_VERSION} ${REPO_DIR})
   export TEST_DEPENDS=$(python3 ./print_deps.py ${MB_PYTHON_VERSION} ${REPO_DIR} -p test)
   before_install
 echo "::endgroup::"
 
 echo "::group::Build wheel"
   export WHEEL_SDIR=wheelhouse
-  export BUILD_DEPENDS=$(python ./print_deps.py ${MB_PYTHON_VERSION} ${REPO_DIR})
   clean_code
   build_wheel
   ls -l "${GITHUB_WORKSPACE}/${WHEEL_SDIR}/"