test_sort_patch_ndims is failing on Alpine

``` bash
  Test: test_sort_patch_ndims ...FAILED
    1. cu_pc_sort.c:358  - CU_ASSERT_EQUAL(pc_patch_is_sorted(pasort1, Y, 1, PC_TRUE),PC_FALSE)
    2. cu_pc_sort.c:359  - CU_ASSERT_EQUAL(pc_patch_is_sorted(pasort1, X_Y, 2, PC_TRUE),PC_FALSE)
```