add libtool to .gitignore

Change-Id: I18230ad8caf1b440eb5437d4f9298af84a262460
Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
diff --git a/.gitignore b/.gitignore
index 4a3c509..41ce902 100644
--- a/.gitignore
+++ b/.gitignore
@@ -28,7 +28,7 @@
 /stamp-h1
 
 # https://www.gnu.org/software/libtool/
-
+/libtool
 /ltmain.sh
 
 # http://www.gnu.org/software/texinfo