gh-95349: Hide a Distutils Warning Filter for test_check_c_globals (GH-95837) (GH-95843)

Under certain build conditions, test_check_c_globals fails.  This fix takes the same approach as we took for gh-84236 (via gh-20095).  We'll be removing use of distutils in the c-analyzer at some point.  Until then we'll hide the warning filter.
(cherry picked from commit 3ff6d9a)

Co-authored-by: Eric Snow <ericsnowcurrently@gmail.com>

Author: miss-islington

Lib/test/test_check_c_globals.py

@@ -1,9 +1,14 @@
 import unittest
 import test.test_tools
+from test.support.warnings_helper import save_restore_warnings_filters
 
 test.test_tools.skip_if_missing('c-analyzer')
 with test.test_tools.imports_under_tool('c-analyzer'):
-    from cpython.__main__ import main
+    # gh-95349: Save/restore warnings filters to leave them unchanged.
+    # Importing the c-analyzer imports docutils which imports pkg_resources
+    # which adds a warnings filter.
+    with save_restore_warnings_filters():
+        from cpython.__main__ import main
 
 
 class ActualChecks(unittest.TestCase):