COMP: Fix GCC warning about unused typedef in ConceptChecking
COMP: Fix GCC warning about unused typedef in ConceptChecking

New in GCC 4.8 is a warning about when a local typedef is not
used. The most frequent offender of this incidental warning is the
concept checking used. This patch uses an approach suggested by Brad
King which uses the type as a template argument, to an instantiated
empty class.

Change-Id: Icc2c89e377639f829e0c1fbed4468c92eae813d5

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