Adjust Windows-only logic in __init__.py (#2553)

This PR suggests small changes to Windows-specific logic in
`__init__.py`

`hasattr(os, "add_dll_directory")` is unnecessary after platform check
and is removed, and `sys.platform == "win32"` is used which is more
commonly seen in the ecosystem and avoids importing `platform` module

Author: ndgrigorian

CHANGELOG.md

@@ -34,6 +34,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 * Replaced `ci` section in `.pre-commit-config.yaml` with a new GitHub workflow with scheduled run to autoupdate the `pre-commit` configuration [#2542](https://github.com/IntelPython/dpnp/pull/2542)
 * FFT module is updated to perform in-place FFT in intermediate steps of ND FFT [#2543](https://github.com/IntelPython/dpnp/pull/2543)
 * Reused dpctl tensor include to enable experimental SYCL namespace for complex types [#2546](https://github.com/IntelPython/dpnp/pull/2546)
+* Changed Windows-specific logic in dpnp initialization [#2553](https://github.com/IntelPython/dpnp/pull/2553)
 
 ### Deprecated
 

dpnp/__init__.py

@@ -40,17 +40,13 @@
 # where to search for DLLs towards both DPNP backend and DPCTL Sycl interface,
 # otherwise DPNP import will be failing. This is because the libraries
 # are not installed under any of default paths where Python is searching.
-from platform import system
-
-if system() == "Windows":  # pragma: no cover
-    if hasattr(os, "add_dll_directory"):
-        os.add_dll_directory(mypath)
-        os.add_dll_directory(dpctlpath)
 
+if sys.platform == "win32":  # pragma: no cover
+    os.add_dll_directory(mypath)
+    os.add_dll_directory(dpctlpath)
     os.environ["PATH"] = os.pathsep.join(
         [os.getenv("PATH", ""), mypath, dpctlpath]
     )
-
     # For virtual environments on Windows, add folder with DPC++ libraries
     # to the DLL search path
     if sys.base_exec_prefix != sys.exec_prefix and os.path.isfile(