update gitignore for more artifacts

Add more autotools artifacts to gitignore file.

Change-Id: Ib935e247a7acba3eedd4c1f7b2bad30bbe04134f
Signed-off-by: Patrick Venture <venture@google.com>
diff --git a/.gitignore b/.gitignore
index fd7987f..134df69 100644
--- a/.gitignore
+++ b/.gitignore
@@ -31,6 +31,15 @@
 Makefile
 Makefile.in
 /stamp-h1
+ar-lib
+compile
+config.guess
+config.sub
+depcomp
+install-sh
+ltmain.sh
+missing
+
 
 # Custom generated files