Fix deps/rabbit PROJECT_ENV

The value was missing a comma, and therefore not a valid erlang term

Author: HoloRin

deps/rabbit/Makefile

@@ -118,7 +118,7 @@ define PROJECT_ENV
 	    {writer_gc_threshold, 1000000000},
 	    %% interval at which connection/channel tracking executes post operations
 	    {tracking_execution_timeout, 15000},
-	    {track_auth_attempt_source, false}
+	    {track_auth_attempt_source, false},
 	    %% Number of entries per index segment.
 	    %% This value can only be changed safely
 	    %% on an empty node. Default calculated