Fixed make_unique to work with C++14+ compilers
Fixed make_unique to work with C++14+ compilers

Previous solution didn't correctly import the make_unique from
C++14/1z when using the new compiler.  This ensures that OC::make_unique
will always work correctly.

Change-Id: Ibb7456f6375c5c16553bb76c71646ec911190c0f
Signed-off-by: Erich Keane <ec9f61fe526c14bb62c55d7c978f025ee6b3583d@intel.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/299
Tested-by: jenkins-iotivity <09cb29e8a2b473a2c978382eec13ee06fa017bda@opendaylight.org>
Reviewed-by: Ossama Othman <9fe229a4f64a31f6d33078e507d28ffd4b94a1af@intel.com>
Reviewed-by: Sudarshan Prasad <18992b2df49d20c769d3f89a8cc0a9f38a9dccaa@intel.com>

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