example add_dll_directory

needed on windows for py>=3.8

example/src/dsodemo/cli.py

@@ -5,10 +5,13 @@ import sys, os
 
 def fixpath():
     path = os.environ.get('PATH', '').split(os.pathsep)
-    moddir = os.path.dirname(__file__)
-    path.append(os.path.join(moddir, 'lib'))
+    libdir = os.path.join(os.path.dirname(__file__), 'lib')
+    path.append(libdir)
     os.environ['PATH'] = os.pathsep.join(path)
 
+    if hasattr(os, 'add_dll_directory'):
+        os.add_dll_directory(libdir)
+
 if sys.platform == "win32":
     fixpath()