Pass exclusives up in WithLegacyResources.

Encountered this issue when running tests for the java pingpong example:
```
$ ./pants goal test tests/java/com/twitter/common/examples/pingpong
:snip:

The following targets could not be loaded:
  tests/java/com/twitter/common/examples/pingpong =>
      File "/Users/bill/code/commons/src/java/com/twitter/common/args/BUILD", line 40, in <module>
          sources = CORE_SOURCES,
      TypeError: __init__() got an unexpected keyword argument 'exclusives'
```

The patch allows tests to run as expected.