[cxxmodules] Add a script which helps finding duplicate header files in pcms.
[cxxmodules] Add a script which helps finding duplicate header files in pcms.

karies/root,olifre/root,root-mirror/root,karies/root,root-mirror/root,karies/root,karies/root,olifre/root,root-mirror/root,root-mirror/root,olifre/root,olifre/root,root-mirror/root,olifre/root,karies/root,root-mirror/root,karies/root,olifre/root,olifre/root,root-mirror/root,olifre/root,karies/root,karies/root,root-mirror/root,olifre/root,olifre/root,karies/root,root-mirror/root,root-mirror/root,olifre/root,karies/root,karies/root,root-mirror/root