Support DLPack on Windows

Since DPC++ 2024.2.0 implements support for default platform context
on Windows, this enables proper support for DLPack exchange on Windows.

Remove special case logic avoiding use of platform.default_context
on Windows.

Author: oleksandr-pavlyk

dpctl/tensor/_dlpack.pyx

@@ -34,8 +34,6 @@ from .._backend cimport (
 )
 from ._usmarray cimport USM_ARRAY_C_CONTIGUOUS, USM_ARRAY_WRITABLE, usm_ndarray
 
-from platform import system as sys_platform
-
 import numpy as np
 
 import dpctl
@@ -44,10 +42,6 @@ import dpctl.memory as dpmem
 from ._device import Device
 
 
-cdef bint _IS_LINUX = sys_platform() == "Linux"
-
-del sys_platform
-
 cdef extern from 'dlpack/dlpack.h' nogil:
     cdef int DLPACK_MAJOR_VERSION
 
@@ -170,12 +164,9 @@ cdef void _managed_tensor_versioned_deleter(DLManagedTensorVersioned *dlmv_tenso
 
 cdef object _get_default_context(c_dpctl.SyclDevice dev) except *:
     try:
-        if _IS_LINUX:
-            default_context = dev.sycl_platform.default_context
-        else:
-            default_context = None
+        default_context = dev.sycl_platform.default_context
     except RuntimeError:
-        # RT does not support default_context, e.g. Windows
+        # RT does not support default_context
         default_context = None
 
     return default_context