[administrivia] Update gitignore files

- Add more stuff, archive libraries, etc..
diff --git a/ospf6d/.gitignore b/ospf6d/.gitignore
index d64e01e..3fef0b7 100644
--- a/ospf6d/.gitignore
+++ b/ospf6d/.gitignore
@@ -15,4 +15,4 @@
 .arch-ids
 *~
 *.loT
-
+*.a