cmake HAVE_LOG4CPP examples

BastilleResearch/gr-lora cmake/Modules/GrMiscUtils.cmake :238 

add_definitions( -DHAVE_LOG4CPP )

BastilleResearch/gr-lora cmake/Modules/GrMiscUtils.cmake :256 

message(STATUS "HAVE_LOG4CPP set to ${HAVE_LOG4CPP}.")