Enable c_code_cache_version of GpuCorrMM3d

theano/sandbox/cuda/blas.py

@@ -1015,7 +1015,7 @@ class BaseGpuCorr3dMM(GpuOp):
 
     def c_code_cache_version(self):
         # raise this whenever modifying any of the support_code_files
-        return None #(0, 1)
+        return (0, 23)
 
     def c_support_code_apply(self, node, nodename):
         # REMEMBER TO RAISE c_code_cache_version when changing any of