THRIFT-2693 Erlang test leaves a lot of generated files

Patch: Roger Meier
diff --git a/lib/erl/test/test_membuffer.erl b/lib/erl/test/test_membuffer.erl
index 7a01143..8892df0 100644
--- a/lib/erl/test/test_membuffer.erl
+++ b/lib/erl/test/test_membuffer.erl
@@ -22,7 +22,7 @@
 -ifdef(TEST).
 -include_lib("eunit/include/eunit.hrl").
 
--include("thriftTest_types.hrl").
+-include("gen-erl/thriftTest_types.hrl").
 
 test_data() ->
   #xtruct {