Remove 'copy_names' parameter from add_using_directive

I noticed that add_using_directive's 'copy_names' parameter is only
used by a single caller.  This patch removes the parameter and changes
that caller to copy the names itself.  I chose to use intern here
since I suspect the names may well be repeated in a given objfile.

Approved-By: John Baldwin <jhb@FreeBSD.org>


4 files changed