bump c code cache version for corr3dMM

theano/tensor/nnet/corr3d.py

@@ -175,7 +175,7 @@ class BaseCorr3dMM(gof.OpenMPOp):
 
     def c_code_cache_version(self):
         # raise this whenever modifying any of the support_code_files
-        return (7, self.openmp, blas_header_version())
+        return (8, self.openmp, blas_header_version())
 
     def c_support_code_apply(self, node, nodename):
         # REMEMBER TO RAISE c_code_cache_version when changing any of