Add ndk debuggable flags

Refs #41441
diff --git a/.gitignore b/.gitignore
index 74f6721..9eac1f8 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,6 @@
 /jni/libcutils
 /obj
+/jni/obj
 /libs
 /bin
 /gen