Add _copy_target_attributes implementation to antlr

Review Request #3547 - Created March 8, 2016 and submitted

Information
Matt Olsen
pants
3021
Reviewers
pants-reviews
dturner-tw, gmalmquist, jsirois, nhoward_tw, patricklaw, stuhood, zundel
A previous code refactor allowed for subclasses to control
which attributes were copied.  Antlr_gen was left out which
caused problems with publish for antlr targets.  This fixes
publishing for antlr targets.

For ref:
https://rbcommons.com/s/twitter/r/3352
https://rbcommons.com/s/twitter/r/3402

Tested locally with failing antlr target.

CI pending: https://travis-ci.org/pantsbuild/pants/builds/114580291

Matt Olsen
Eric Ayers
David Turner
Garrett Malmquist
Nick Howard (Twitter)
Matt Olsen
Review request changed

Status: Closed (submitted)

Change Summary:

commit 4d44cd6808019d99aa46fc33562d0010aa61e45f

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