include: Add partial propsys header.
diff --git a/.gitignore b/.gitignore
index 1356e98..7776339 100644
--- a/.gitignore
+++ b/.gitignore
@@ -177,6 +177,7 @@
 include/optary.h
 include/perhist.h
 include/propidl.h
+include/propsys.h
 include/pstore.h
 include/qedit.h
 include/richole.h