[3.5] bpo-30876: Add new import test files to projects. (GH-2851). (#2913)

(cherry picked from commit d5ed47d)

Author: serhiy-storchaka

Makefile.pre.in

@@ -1187,6 +1187,7 @@ LIBSUBDIRS=	tkinter tkinter/test tkinter/test/test_tkinter \
 		test/test_import/data \
 		test/test_import/data/circular_imports \
 		test/test_import/data/circular_imports/subpkg \
+		test/test_import/data/package2 \
 		test/test_importlib/namespace_pkgs \
 		test/test_importlib/namespace_pkgs/both_portions \
 		test/test_importlib/namespace_pkgs/both_portions/foo \