dwarf branch

[Roland McGrath <roland at redhat dot com>]

I moved the roland/dwarf-c++ branch to just be called "dwarf",
and merged pmachata/dwarflint into it.  I decided we'll put the
new library code in libdw/c++/ and not give it a separate makefile.
The one file there hasn't changed yet and still stands to get largely
rewritten.  We can easily rename it we want.

I also added the dwarflint-self test.  It might break if you build without -g.
We should probably give dwarflint an "ok if no DWARF at all" option and
then use that in this test.

Petr, push directly on this branch for dwarflint changes unless you think
they might need special caution beyond the normal (eventual) code review.

(If you stop using an old personal branch and want to remove it from the
server, you can do "git push origin :my/branch".)


Thanks,
Roland