based on #24864

Pull Request Readiness Checklist

See details at https://github.com/opencv/opencv/wiki/How_to_contribute#making-a-good-pull-request

• I agree to contribute to the project under Apache 2 License.
• To the best of my knowledge, the proposed patch is not based on a code under GPL or another license that is incompatible with OpenCV
• The PR is proposed to the proper branch
• There is a reference to the original bug report and related work
• There is accuracy test, performance test and test data in opencv_extra repository, if applicable
  Patch to opencv_extra has the same branch name.
• The feature is well documented and sample code can be built with the project CMake

What build errors this PR solved

When building with qnx-sdp-700 with code in this PR: #24864,
there is compile error:

[ 38%] Building CXX object modules/core/CMakeFiles/opencv_core.dir/src/trace.cpp.o
/builds/3rdparty/opencv-build/opencv/modules/core/src/system.cpp:131:20: error: expected primary-expression before 'auto'
 constexpr decltype(auto) AT_HWCAP = NT_GNU_HWCAP;
                    ^

decltype(auto) seems to be an C++14 introduced feature, intead of C++11.
uint64_t is OK when build locally.

asmorkalov