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Try removing attempt to set the C++ standard (#1464)

* Try removing attempt to set the C++ standard

Fixes #1460 #1462

* set the standard to 11

* spell it right

* had it right the first time

* require std 11

* plumb through the standard to cxxfeaturecheck

* use policy instead

* can't use policy just yet

* Update CXXFeatureCheck.cmake

* fix CXX_STANDARD_REQUIRED statement

Co-authored-by: Dominic Hamon <dominichamon@users.noreply.github.com>