Builds: properly declare "include"

Author: PMeira

setup.py

@@ -83,7 +83,7 @@
 
 setup(
     version=package_version,
-    packages=['dss_python_backend', 'dss_python_backend/include'],
+    packages=['dss_python_backend', 'dss_python_backend.include'],
     setup_requires=["cffi>=2.0.0"],
     cffi_modules= [
         "dss_build.py:ffi_builder_dss",