With the recent snapshot of TriBITS in commit:

    Automatic snapshot commit from tribits at 48da277

    Origin repo remote tracking branch: 'origin/master'
    Origin repo remote repo URL: 'origin = git@github.com:TriBITSPub/TriBITS'

    At commit:

    48da277 Fail hard when C++11 is enabled but support is not verified (TriBITS #64)
    Author: Roscoe A. Bartlett <bartlettra@ornl.gov>
    Date: Tue Apr 14 19:28:37 2015 -0400

TriBITS now will fail hard if Trilinos_ENABLE_CXX11=ON but support for C++11
cannot be verified.  Therefore, there is no need for this CMake code in this
file.