software/erp5: remove bin/2to3

we are not using this command line utility, in erp5 tests (
product/ERP5Type/tests/Python3StyleTest.py ) we are using the python
API directly, not the command line.

if developer needs to invoke 2to3 it is present in ${python:location}/bin/

software/erp5/software-py3.cfg

@@ -19,6 +19,3 @@ develop = true
 #   The requirement ('msgpack<1,>=0.5.6') is not allowed by your [versions] constraint (1.0.5)
 revision = c4443632e3541c064f5b43096099f4a8b74cbf58
 
-[template-zope]
-link-binary +=
-  ${python3:location}/bin/2to3

software/erp5/software.cfg

@@ -3,6 +3,3 @@ extends =
   ../../stack/erp5/buildout.cfg
   ../../stack/slapos-py2.cfg
 
-[template-zope]
-link-binary +=
-  ${python2.7:location}/bin/2to3