Another crash fix on windows due to no support for C99.

theano/tensor/subtensor.py

@@ -644,6 +644,9 @@ class Subtensor(Op):
         len_is_slice = len(is_slice)
 
         len_subtensor_spec = spec_pos()
+        subensor_spec = "npy_intp subtensor_spec[%(len_subtensor_spec)s];" % locals()
+        if len_subtensor_spec == 0:
+            subensor_spec = "npy_intp * subtensor_spec = NULL;"
 
         if is_slice:
             is_slice_init = "int is_slice[] = {" + ",".join([str(s) for s in is_slice]) + "};"
@@ -677,7 +680,7 @@ class Subtensor(Op):
         // and updating stride, shape, and data pointers
 
         %(is_slice_init)s
-        npy_intp subtensor_spec[%(len_subtensor_spec)s];
+        %(subensor_spec)s
         %(subtensor_init)s;
         int spec_pos = 0; //position in subtensor_spec
         int inner_ii = 0; // the current dimension of zview