[Do not merge][16_0_ROOT6_X] Enable ROOT debug

[makortel]

To aid debugging in cms-sw/cmssw#49333

Cherry-picked from #10059

[cmsbuild]

A new Pull Request was created by @makortel for branch IB/CMSSW_16_0_X/rootmaster.

@akritkbehera, @cmsbuild, @iarspider, @smuzaffar can you please review it and eventually sign? Thanks.
@ftenchini, @mandrenguyen, @sextonkennedy you are the release manager for this.
cms-bot commands are listed here

[cmsbuild]

cms-bot internal usage

[makortel]

@cmsbuild, please build

[cmsbuild]

+1

Summary: https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-1c7325/49345/summary.html
COMMIT: f142488
CMSSW: CMSSW_16_0_ROOT6_X_2025-11-06-2300/el8_amd64_gcc13
User test area: For local testing, you can use /cvmfs/cms-ci.cern.ch/week0/cms-sw/cmsdist/10184/49345/install.sh to create a dev area with all the needed externals and cmssw changes.

The following merge commits were also included on top of IB + this PR after doing git cms-merge-topic:

• @cms-sw OpenMPI: Patch for missing string.h not needed anymore #10183
• @fwyzard Update OpenMPI to v5.0.9 #10182

You can see more details here:
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-1c7325/49345/git-recent-commits.json
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-1c7325/49345/git-merge-result