[PATCH] Enable simple invocation of runtest in testsuite

[Matthias Kretz]

I noticed this inconvenience while learning dejagnu.

From: Matthias Kretz <kretz@kde.org>

        * testsuite/Makefile.am: Remove dup target_triplet and set tool,
        allowing runtest to work without arguments.
---
 libstdc++-v3/testsuite/Makefile.am | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

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