Fixed python3_sitelib for debbuild in OBS

Author: schaefi

package/python-kiwi-spec-template

@@ -29,8 +29,12 @@
 %endif
 
 %if %{undefined python3_sitelib}
+%if "%{_vendor}" == "debbuild"
+%global python3_sitelib %(%{__python3} -c "from distutils.sysconfig import get_python_lib; print(get_python_lib())")
+%else
 %global python3_sitelib %(%{__python3} -c "import sysconfig; print(sysconfig.get_path('platlib'))")
 %endif
+%endif
 
 %if %{undefined python3_version}
 %global python3_version %(%{__python3} -Esc "import sys; sys.stdout.write('{0.major}.{0.minor}'.format(sys.version_info))")