Fix the dictionary generation on several platforms

[tmadlener]

BEGINRELEASENOTES

• Make sure to explicitly have the LCIO headers available for building against them.
• Backport a patch that has been part of the spack recipe in key4hep-spack for 4 years now.

ENDRELEASENOTES

The first one is necessary for me to build LCFIPlus using iLCInstall on EL9 with gcc13.1 and ROOT v6.32/08. I cannot reprodce this with gcc13.2 and ROOT v6.32/06 on Ubuntu, so I am not yet sure what the actual problem is there, but in any case, it doesn't hurt.

The second one has been part of the LCFIPlus package in key4hep-spack for quite some time now. It was originally added by @andresailer, maybe he still has a recollection of how that came to be.

---

build log for that is fixed by the first commit

[  3%] generating: /afs/desy.de/project/ilcsoft/sw/x86_64_gcc131_el9/v02-03-04/LCFIPlus/v00-10-01/build/rootdict/dict.cc /afs/desy.de/project/ilcsoft/sw/x86_64_gcc131_el9/v02-03-04/LCFIPlus/v00-10-01/build/rootdict/dict_rdict.pcm
input_line_9:17:10: fatal error: 'EVENT/Cluster.h' file not found
#include "EVENT/Cluster.h"
         ^~~~~~~~~~~~~~~~~

[tmadlener]

@suehara can this be merged as well and put into a new tag for LCFIPlus? Otherwise I will not be able to make a new iLCSoft release.