COMP: niral_utilitiesExternalProject: Conditionally specify CMAKE_BUNDLE_OUTPUT_DIRECTORY
COMP: niral_utilitiesExternalProject: Conditionally specify CMAKE_BUNDLE_OUTPUT_DIRECTORY

This helps reduce the number of warning related to unused CMake variables
when configuring the project on a platform different from macOS.

NIRALUser/niral_utilities,NIRALUser/niral_utilities,NIRALUser/niral_utilities