CMP0047
-------

Use QCC compiler id for the qcc drivers on QNX.

CMake 2.8.12 and lower assigned the QNX qcc and QCC compiler drivers the "GNU"
compiler id.

The OLD behavior for this policy is to use the "GNU" compiler id for the qcc
and QCC compiler drivers. The NEW behavior for this policy is to use the "QCC"
compiler id for those drivers.

This policy was introduced in CMake version 3.0.
CMake version |release| warns when the policy is not set and uses
OLD behavior.  Use the cmake_policy command to set it to OLD or
NEW explicitly.
