bump c code cache version of CorrMM

theano/tensor/nnet/corr.py

@@ -174,7 +174,7 @@ class BaseCorrMM(gof.OpenMPOp):
 
     def c_code_cache_version(self):
         # raise this whenever modifying any of the support_code_files
-        return (6, self.openmp, blas_header_version())
+        return (7, self.openmp, blas_header_version())
 
     def c_support_code_apply(self, node, nodename):
         # REMEMBER TO RAISE c_code_cache_version when changing any of