ignore Modules/python.exp on AIX (autogenerated) (GH-19607)

diff --git a/.gitignore b/.gitignore
index 8c1f8a4..0962d3a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -71,6 +71,7 @@
 Programs/_testembed
 PC/python_nt*.h
 PC/pythonnt_rc*.h
+Modules/python.exp
 PC/*/*.exp
 PC/*/*.lib
 PC/*/*.bsc