Fix -Wshadow warnings in dwarf2.c (seen on alpha-tru64)

[Joel Brobecker]

The patch itself is fairly mechanical; I just renamed a couple of local
variables.  One of them (dirname) was renamed because it shadowed a function
with the same name.  The second one (subdirname) was renamed out of
consistency...

2010-01-01  Joel Brobecker  <brobecker@adacore.com>

        Fix -Wshadow warnings in dwarf2.c (seen on alpha-tru64).
        * dwarf2.c (concat_filename): Rename dirname with dir_name
        to void shadowing the dirname function.
        Rename subdirname with subdir_name to stay consistent with
        the new dir_name variable name.

OK to apply?

Thanks,
-- 
Joel
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