Link to libsnapshot_cow and libz where libsnapshot is linked. am: 6c190a2d71 am: 92d0449a32 am: 61cfbeacea

Original change: https://android-review.googlesource.com/c/platform/system/update_engine/+/1443597

Change-Id: I8bfbf703b01f515afbf67dc7a942cdc9dcab7979
diff --git a/Android.bp b/Android.bp
index 27ba172..52019b6 100644
--- a/Android.bp
+++ b/Android.bp
@@ -203,6 +203,8 @@
         "libgsi",
         "libpayload_consumer",
         "libsnapshot",
+        "libsnapshot_cow",
+        "libz",
         "update_metadata-protos",
     ],
     shared_libs: [