[CORE] fixes needed to build cxxmodules

[smuzaffar]

• External CLHEP should be fixed to include vector and ostream in CLHEP/Matrix/*.h . This PR adds the missing headers to avoid build errors for CXXMODULES IBs.

[cmsbuild]

The code-checks are being triggered in jenkins.

[cmsbuild]

+code-checks

Logs: https://cmssdt.cern.ch/SDT/code-checks/cms-sw-PR-26961/10009

• This PR adds an extra 12KB to repository

[cmsbuild]

A new Pull Request was created by @smuzaffar (Malik Shahzad Muzaffar) for master.

It involves the following packages:

DataFormats/CLHEP

@cmsbuild, @smuzaffar, @Dr15Jones can you please review it and eventually sign? Thanks.
@rovere this is something you requested to watch as well.
@davidlange6, @slava77, @fabiocos you are the release manager for this.

cms-bot commands are listed here

[smuzaffar]

please test

[cmsbuild]

The tests are being triggered in jenkins.
https://cmssdt.cern.ch/jenkins/job/ib-run-pr-tests/538/console Started: 2019/05/27 17:18

[cmsbuild]

+1
Tested at: 4f68d90
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-b074a1/538/summary.html

The following merge commits were also included on top of IB + this PR after doing git cms-merge-topic:
067a360
3405700
6ab9424
39fdf6d
f08fec1
d4f63ec
389296d
5c7a7ef
3f0fd84
You can see more details here:
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-26961/538/git-log-recent-commits
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-26961/538/git-merge-result

[cmsbuild]

Comparison job queued.

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-b074a1/538/summary.html

Comparison Summary:

• No significant changes to the logs found
• Reco comparison results: 2 differences found in the comparisons
• DQMHistoTests: Total files compared: 33
• DQMHistoTests: Total histograms compared: 3209232
• DQMHistoTests: Total failures: 2
• DQMHistoTests: Total nulls: 0
• DQMHistoTests: Total successes: 3208896
• DQMHistoTests: Total skipped: 334
• DQMHistoTests: Total Missing objects: 0
• DQMHistoSizes: Histogram memory added: 0.0 KiB( 32 files compared)
• Checked 137 log files, 14 edm output root files, 33 DQM output files

[Dr15Jones]

+1

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next master IBs (tests are also fine). This pull request will now be reviewed by the release team before it's merged. @davidlange6, @slava77, @smuzaffar, @fabiocos (and backports should be raised in the release meeting by the corresponding L2)

[kpedro88]

+1