Remove unnecessary files in .toml

pyproject.toml

@@ -79,10 +79,7 @@ build-backend = "setuptools.build_meta"
 [tool.setuptools.package-data]
 pystencils = [
     "include/*.h",
-    "backends/cuda_known_functions.txt",
-    "backends/opencl1.1_known_functions.txt",
-    "boundaries/createindexlistcython.c",
-    "boundaries/createindexlistcython.pyx",
+    "boundaries/createindexlistcython.pyx"
 ]
 
 [tool.setuptools.packages.find]

setup.py

@@ -10,9 +10,11 @@ if int(setuptools_version.split('.')[0]) < 61:
 
 import versioneer
 
+
 def get_cmdclass():
     return versioneer.get_cmdclass()
 
+
 setup(
     version=versioneer.get_version(),
     cmdclass=get_cmdclass(),