Fix distutils test_install for shared CPython builds
diff --git a/Lib/distutils/tests/test_install.py b/Lib/distutils/tests/test_install.py
index 2133fa7..e065aa3 100644
--- a/Lib/distutils/tests/test_install.py
+++ b/Lib/distutils/tests/test_install.py
@@ -202,6 +202,7 @@
         support.copy_xxmodule_c(project_dir)
 
         buildcmd = build_ext(dist)
+        support.fixup_build_ext(buildcmd)
         buildcmd.ensure_finalized()
         buildcmd.run()