Update OpenBLAS to 0.3.15

[mrodozov]

see #6933 (comment)

[cmsbuild]

A new Pull Request was created by @mrodozov (Mircho Rodozov) for branch IB/CMSSW_12_0_X/master.

@cmsbuild, @smuzaffar, @mrodozov, @iarspider can you please review it and eventually sign? Thanks.
cms-bot commands are listed here

[mrodozov]

test parameters:

• release = CMSSW_12_0_SKYLAKEAVX512_X

[mrodozov]

please test

[smuzaffar]

please test for CMSSW_12_0_X/slc7_amd64_gcc900

[cmsbuild]

+1

Summary: https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-ec953f/15551/summary.html
COMMIT: 0d506de
CMSSW: CMSSW_12_0_X_2021-06-01-2300/slc7_amd64_gcc900
User test area: For local testing, you can use /cvmfs/cms-ci.cern.ch/week1/cms-sw/cmsdist/6963/15551/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:

• Update tag for RecoJets-JetProducers to V05-14-00 #6961 @cms-sw: Update tag for RecoJets-JetProducers to V05-14-00
• dropping more python2 tools  #6955 @davidlange6: dropping more python2 tools
• adding ppjjjj openloop library #6956 @SiewYan: adding ppjjjj openloop library

You can see more details here:
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-ec953f/15551/git-recent-commits.json
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-ec953f/15551/git-merge-result

Comparison Summary

Summary:

• No significant changes to the logs found
• Reco comparison results: 0 differences found in the comparisons
• DQMHistoTests: Total files compared: 37
• DQMHistoTests: Total histograms compared: 2650486
• DQMHistoTests: Total failures: 1
• DQMHistoTests: Total nulls: 0
• DQMHistoTests: Total successes: 2650463
• DQMHistoTests: Total skipped: 22
• DQMHistoTests: Total Missing objects: 0
• DQMHistoSizes: Histogram memory added: 0.0 KiB( 36 files compared)
• Checked 155 log files, 37 edm output root files, 37 DQM output files
• TriggerResults: no differences found

[smuzaffar]

+externals

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next IB/CMSSW_12_0_X/master IBs (tests are also fine). This pull request will now be reviewed by the release team before it's merged. @silviodonato, @dpiparo, @qliphy (and backports should be raised in the release meeting by the corresponding L2)