clnag version fix (4.0.0-mlhled2 to 3.8.0)

[mrodozov]

clang version was 4.0.0 in the specs wrt the real version being 3.8.0 (Mentioned by Andrea Bocci). This commit provides the fix to avoid ambiguity.

[cmsbuild]

A new Pull Request was created by @mrodozov for branch IB/CMSSW_9_1_X/gcc530.

@cmsbuild, @smuzaffar, @iahmad-khan, @davidlange6 can you please review it and eventually sign? Thanks.
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[mrodozov]

please test

[cmsbuild]

The tests are being triggered in jenkins.
https://cmssdt.cern.ch/jenkins/job/ib-any-integration/19324/console

[cmsbuild]

+1
Tested at: 11a36e7
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-2972/19324/summary.html

[cmsbuild]

Comparison job queued.

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-2972/19324/summary.html

Comparison Summary:

• You potentially added 31 lines to the logs
• Reco comparison results: 1660 differences found in the comparisons
• DQMHistoTests: Total files compared: 23
• DQMHistoTests: Total histograms compared: 1826171
• DQMHistoTests: Total failures: 9622
• DQMHistoTests: Total nulls: 0
• DQMHistoTests: Total successes: 1816376
• DQMHistoTests: Total skipped: 173
• DQMHistoTests: Total Missing objects: 0
• Checked 94 log files, 14 edm output root files, 23 DQM output files