CMake: add_dd4hep_dictionary: try to ensure we recreate the dictionary when any input changes

I hope this will work fine. If the list of headers or linkdefs changes, then cmake should re-run anyway and that will call the file(Generate) to recreate the script, and if only the file content of headers or linkdefs changes, we only have to re-run the shell script.

cmake/DD4hepBuild.cmake

@@ -608,7 +608,7 @@ function(dd4hep_add_dictionary dictionary )
     )
     add_custom_command(OUTPUT ${dictionary}.cxx ${output_dir}/${dictionary}_rdict.pcm
       COMMAND /bin/sh fixed_create_${dictionary}_$<CONFIG>CXX.sh
-      DEPENDS fixed_create_${dictionary}_$<CONFIG>CXX.sh
+      DEPENDS fixed_create_${dictionary}_$<CONFIG>CXX.sh ${headers} ${linkdefs}
     )
   else()
     add_custom_command(OUTPUT ${dictionary}.cxx ${output_dir}/${dictionary}_rdict.pcm