amends work done in pull request #6976.

    Non  existence of _FPU_EXTENDED definition on powerpc64 (like it is for apple and arm)
    prevent compilation when WITH_CUDA is set. Adding powerpc64 as case to not use these
    definitions

        modifié:         modules/cudalegacy/test/TestHaarCascadeApplication.cpp
        modifié:         modules/cudalegacy/test/test_precomp.hpp
Signed-off-by: Thierry Fauck <tfauck@free.fr>

  * NAN is not defined on some platform
  * follow the comment on PR

 * test build on VS2012

  * NAN is not defined on some platform

  * indent line