File katana-warnings.patch of Package katana

diff -Ndurp katana/src/ktn_os.erl katana-warnings/src/ktn_os.erl
--- katana/src/ktn_os.erl	2018-10-23 19:08:51.379561037 +0300
+++ katana-warnings/src/ktn_os.erl	2018-10-23 19:09:35.995123848 +0300
@@ -64,7 +64,7 @@ shell_cmd() -> "/bin/sh -s unix:cmd".
 %% DOWN message is after them all.
 flush_until_down(Port, MonRef) ->
   receive
-    {Port, {data, Bytes}} ->
+    {Port, {data, _Bytes}} ->
       flush_until_down(Port, MonRef);
     {'DOWN', MonRef, _, _, _} ->
       flush_exit(Port)