Remove unused declarations in libtensor sources

Author: antonwolfy

dpctl_ext/tensor/libtensor/source/tensor_ctors.cpp

@@ -71,9 +71,6 @@ static_assert(std::is_same_v<py::ssize_t, dpctl::tensor::ssize_t>);
 namespace
 {
 
-using dpctl::tensor::c_contiguous_strides;
-using dpctl::tensor::f_contiguous_strides;
-
 using dpctl::tensor::overlap::MemoryOverlap;
 using dpctl::tensor::overlap::SameLogicalTensors;