Fix nvcc.profile and update CUDA compiler flags (10.0.x)

[fwyzard]

• let nvcc find its components when invoked from the command line
• update default CUDA compilation flags to include -O2 -std=c++14

[fwyzard]

backport #3740

[cmsbuild]

A new Pull Request was created by @fwyzard (Andrea Bocci) for branch IB/CMSSW_10_0_X/gcc630.

@cmsbuild, @smuzaffar, @gudrutis, @mrodozov can you please review it and eventually sign? Thanks.
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• Backported from Fix nvcc.profile and update CUDA compiler flags (10.1.x) #3740

[fwyzard]

@cmsbuild please test

[fwyzard]

type bugfix

[cmsbuild]

The tests are being triggered in jenkins.
https://cmssdt.cern.ch/jenkins/job/ib-any-integration/26092/console

[cmsbuild]

+1
Tested at: 85d5d13
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-3741/26092/summary.html

[cmsbuild]

Comparison job queued.

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-3741/26092/summary.html

Comparison Summary:

• No significant changes to the logs found
• Reco comparison results: 2 differences found in the comparisons
• DQMHistoTests: Total files compared: 27
• DQMHistoTests: Total histograms compared: 2469361
• DQMHistoTests: Total failures: 1
• DQMHistoTests: Total nulls: 0
• DQMHistoTests: Total successes: 2469191
• DQMHistoTests: Total skipped: 169
• DQMHistoTests: Total Missing objects: 0
• DQMHistoSizes: Histogram memory added: 1.46 KiB( 22 files compared)
• Checked 111 log files, 9 edm output root files, 27 DQM output files