Use makefile from upstream

Makefile

@@ -4,24 +4,31 @@ CFLAGS ?= "-O0"
 PYAV_PYTHON ?= python
 PYTHON := $(PYAV_PYTHON)
 
-.PHONY: default build fate-suite test clean-build clean-src clean test
+
+.PHONY: default build clean fate-suite lint test
+
 default: build
 
+
 build:
 	CFLAGS=$(CFLAGS) LDFLAGS=$(LDFLAGS) $(PYTHON) setup.py build_ext --inplace --debug
 
+clean:
+	- find av -name '*.so' -delete
+	- rm -rf build
+	- rm -rf sandbox
+	- rm -rf src
+	- make -C docs clean
+
 fate-suite:
 	# Grab ALL of the samples from the ffmpeg site.
 	rsync -vrltLW rsync://fate-suite.ffmpeg.org/fate-suite/ tests/assets/fate-suite/
 
-test:
-	$(PYTHON) setup.py test
-
-clean-build:
-	- rm -rf build
-	- find av -name '*.so' -delete
+lint:
+	black --check av examples tests setup.py
+	flake8 av examples tests
+	isort --check-only --diff av examples tests
+	mypy av tests
 
-clean-src:
-	- rm -rf src
-
-clean: clean-build clean-src
+test:
+	$(PYTHON) setup.py test