Fix to propagate definitions properly to depending compilation units

CMakeLists.txt

@@ -209,6 +209,9 @@ ELSE()
   IF(DD4HEP_BUILD_DEBUG MATCHES "ON" OR (CMAKE_BUILD_TYPE MATCHES "DEBUG|Debug" AND NOT DD4HEP_BUILD_DEBUG MATCHES "OFF"))
     message(STATUS "BUILD DD4HEP and depending software with debug extensions")
     target_compile_definitions(DDCore PUBLIC DD4HEP_DEBUG=1)
+    set(DD4HEP_BUILD_DEBUG ON)
+  ELSE()
+    set(DD4HEP_BUILD_DEBUG OFF)
   ENDIF()
 
   message(STATUS "BUILD Packages: ${DD4HEP_BUILD_PACKAGES}")