Update .gitignore for generated libtool file

Signed-off-by: Zhenfei Tai <ztai@google.com>
Change-Id: Ib5a2523699d90b7700170b4e40b9225349e230dd
diff --git a/.gitignore b/.gitignore
index 04d8cc5..7cc63e3 100644
--- a/.gitignore
+++ b/.gitignore
@@ -44,7 +44,7 @@
 /phosphor-user-manager
 Makefile
 .deps
-/*-libtool
+/*libtool
 .project
 /phosphor-ldap-mapper/phosphor-ldap-mapper
 /phosphor-ldap-config/phosphor-ldap-conf