gitignore: ignore tests/oap/oap_test

Change-Id: Iccb8c46a721d5389058c5cf36621820bcd861b7b
diff --git a/.gitignore b/.gitignore
index 50209b0..d333b27 100644
--- a/.gitignore
+++ b/.gitignore
@@ -96,6 +96,7 @@
 tests/tlv/tlv_test
 tests/fsm/fsm_test
 tests/write_queue/wqueue_test
+tests/oap/oap_test
 
 utils/osmo-arfcn
 utils/osmo-auc-gen