libstdc++ execute tests

[Gabriel Dos Reis]

Benjamin Kosnik <bkoz@redhat.com> writes:

| I am not noticing the same problem that you are. However, with your patch 
| everything still works for me, so you might as well check it in.

As a short-term solution, yes.  

Because dg-test will disappear in the near future, I still need to
understand why this isn't

 set results [remote_load target $lib_env(LIBTOOL) "--mode=execute ./$prog"]

working for him.

-- Gaby
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