Set `PYTHON_INCLUDE_DIR` in `setup.py` and pass it to CMake #378

	on:
	push:
	branches:
	# Only check pushes to master
	- master
	paths:
	# Only check formatting when python files are changed.
	- '*/.py'
	pull_request:
	# Check PRs for all branches
	paths:
	# Only check formatting when python files are changed.
	- '*/.py'

	jobs:
	format:
	name: Format check
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v2
	with:
	fetch-depth: 0
	- uses: actions/setup-python@v1
	with:
	python-version: '3.7'
	architecture: 'x64'
	- name: Install dev requirements
	run: pip install -r dev-requirements.txt
	- name: Format
	run: check/format-incremental

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