Fix PyAssimp under Python >= 3.12 and macOS library search support (#5397)

* Fix PyAssimp under Python >= 3.12

* Make PyAssimp search DYLD_LIBRARY_PATH under macOS

---------

Co-authored-by: Kim Kulling <[email protected]>

port/PyAssimp/pyassimp/helper.py

@@ -5,13 +5,17 @@ Some fancy helper functions.
 """
 
 import os
+import platform
 import ctypes
 import operator
 
-from distutils.sysconfig import get_python_lib
 import re
 import sys
 
+have_distutils = sys.version_info[0] < 3 and sys.version_info[1] < 12
+if have_distutils:
+    from distutils.sysconfig import get_python_lib
+
 try: import numpy
 except ImportError: numpy = None
 
@@ -32,10 +36,14 @@ if os.name=='posix':
 
     if 'LD_LIBRARY_PATH' in os.environ:
         additional_dirs.extend([item for item in os.environ['LD_LIBRARY_PATH'].split(':') if item])
+    
+    if platform.system() == 'Darwin':
+        if 'DYLD_LIBRARY_PATH' in os.environ:
+            additional_dirs.extend([item for item in os.environ['DYLD_LIBRARY_PATH'].split(':') if item])
 
     # check if running from anaconda.
     anaconda_keywords = ("conda", "continuum")
-    if any(k in sys.version.lower() for k in anaconda_keywords):
+    if have_distutils and any(k in sys.version.lower() for k in anaconda_keywords):
       cur_path = get_python_lib()
       pattern = re.compile('.*\/lib\/')
       conda_lib = pattern.match(cur_path).group()