Add config/ar-lib to .gitignore

Signed-off-by: Josh Stone <jistone@redhat.com>
diff --git a/.gitignore b/.gitignore
index d463556..1eda00b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -25,6 +25,7 @@
 config.h.in
 config.log
 config.status
+config/ar-lib
 config/config.guess
 config/config.sub
 config/depcomp