Fix recent workflow fail and react on latest flake8 lint warnings

setup.py

@@ -1,11 +1,15 @@
 from setuptools import setup
 import platform
 
+
 def check_platform():
     if platform.system() != "Linux":
         raise RuntimeError("This package does only support Linux")
     print("Installing on platform: ", platform.system())
 
+
+check_platform()
+
 setup(name="pyframebuffer",
       version="1.0",
       author="Adrian Roß",
@@ -16,6 +20,4 @@ def check_platform():
       long_description="A linux library written in C and Python to draw with graphic primitives to the framebuffer.",
       maintainer="Adrian Roß",
       maintainer_email="[email protected]",
-      url="https://github.com/RossAdrian/pyframebuffer",
-      cmdclass={'install': check_platform}
-     )
+      url="https://github.com/RossAdrian/pyframebuffer")