bpo-28254: Add PyGC_ functions to the stable ABI manifest (GH-25720)

Co-authored-by: Senthil Kumaran <senthil@uthcode.com>
Co-authored-by: scoder <stefan_ml@behnel.de>
diff --git a/PC/python3dll.c b/PC/python3dll.c
index a53ec63..574d4dc 100755
--- a/PC/python3dll.c
+++ b/PC/python3dll.c
@@ -271,6 +271,9 @@ EXPORT_FUNC(PyFrame_GetCode)
 EXPORT_FUNC(PyFrame_GetLineNumber)
 EXPORT_FUNC(PyFrozenSet_New)
 EXPORT_FUNC(PyGC_Collect)
+EXPORT_FUNC(PyGC_Disable)
+EXPORT_FUNC(PyGC_Enable)
+EXPORT_FUNC(PyGC_IsEnabled)
 EXPORT_FUNC(PyGILState_Ensure)
 EXPORT_FUNC(PyGILState_GetThisThreadState)
 EXPORT_FUNC(PyGILState_Release)