Changes to scan_perform.c.txt to sync with the python implementaion

All these changes have been generated by cython, and as such I don't think they need to be reviewed but rather reviewing the cython code should be more then sufficient.

Changes to scan_perform.c.txt to sync with the python implementaion
815b54cb · Razvan Pascanu · 6a0b74bc · 815b54cb
--- a/theano/scan_module/scan_perform.c.txt
+++ b/theano/scan_module/scan_perform.c.txt