[RFA/dwarf2] Fix name of include psymtabs, avoid duplicates

[Joel Brobecker]

>  > > 2004-10-16  Joel Brobecker  <brobecker@gnat.com>
>  > > 
>  > >         * dwarf2read.c (dwarf_decode_lines): Use the complete filename
>  > >         when creating include psymtabs.
>  > > 
>  > > Tested on x86-linux, no regression.
>  > > OK to apply?
> 
> Yes, after you add the test, which should fail before and pass after
> your patch.

I'll see what I can come up with, and commit the patch once a testcase
for it has been added.

Thanks for the review,
-- 
Joel