Revert "testsuite: Fix introspection test on Windows"

This change is no longer necessary now that we properly set the right
directory for the needed DLLs.

This reverts commit 3471c22f52.

testsuite/introspection/api.py

@@ -1,19 +1,7 @@
 #! /usr/bin/env python3
 
-import os
 import sys
 
-# Python 3.8.x or later on Windows require os.add_dll_directory()
-# to be called on every directory that contains the required
-# non-bundled, non-system DLLs of a module so that the module can
-# be loaded successfully by Python.  Make things easiler for people
-# by calling os.add_dll_directory() on the valid paths in %PATH%.
-if hasattr(os, 'add_dll_directory'):
-    paths = reversed(os.environ['PATH'].split(os.pathsep))
-    for path in paths:
-        if path != '' and os.path.isdir(path):
-            os.add_dll_directory(path)
-
 try:
     import gi
 except ImportError: