opus - May 2013 - [Patch] Check if opus_compare is executable in run_vectors.sh

If opus_compare doesn't exist or isn't executable, tests failed normally
which could be misleading.
So test for existence and mode to avoid this ambiguity.
-- 
Aur?lien Zanelli
Parrot SA
174, quai de Jemmapes
75010 Paris
France
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