THRIFT-2693 Erlang test leaves a lot of generated files

Patch: Roger Meier
diff --git a/lib/erl/test/test_thrift_1151.erl b/lib/erl/test/test_thrift_1151.erl
index 9cee486..8b1d937 100644
--- a/lib/erl/test/test_thrift_1151.erl
+++ b/lib/erl/test/test_thrift_1151.erl
@@ -1,6 +1,6 @@
 -module(test_thrift_1151).
 
--include("thrift1151_types.hrl").
+-include("gen-erl/thrift1151_types.hrl").
 
 -ifdef(TEST).
 -include_lib("eunit/include/eunit.hrl").