[FIX] runbot: Fix csrf error in rebuild method

Runbot is intended to be run on a 8.0 instance but if runs on a 9.0, CSRF needs
to be disabled. Will not break on 8.0 code.

Closes odoo#84

runbot/runbot.py

@@ -1363,7 +1363,7 @@ def build(self, build_id=None, search=None, **post):
         #context['level'] = level
         return request.render("runbot.build", context)
 
-    @http.route(['/runbot/build/<build_id>/force'], type='http', auth="public", methods=['POST'])
+    @http.route(['/runbot/build/<build_id>/force'], type='http', auth="public", methods=['POST'], csrf=False)
     def build_force(self, build_id, **post):
         registry, cr, uid, context = request.registry, request.cr, request.uid, request.context
         repo_id = registry['runbot.build'].force(cr, uid, [int(build_id)])