Vector.icc: replace stdlib.h with cstdlib

[smuzaffar]

No description provided.

[smuzaffar]

please test

[cmsbuild]

A new Pull Request was created by @smuzaffar for branch cms/v2.4.7.1.

@akritkbehera, @iarspider, @smuzaffar can you please review it and eventually sign? Thanks.
@ftenchini, @mandrenguyen, @sextonkennedy you are the release manager for this.
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[cmsbuild]

cms-bot internal usage

[cmsbuild]

+1

Summary: https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-48072b/48173/summary.html
COMMIT: 646cbcb
CMSSW: CMSSW_16_0_X_2025-09-16-1100/el8_amd64_gcc12
User test area: For local testing, you can use /cvmfs/cms-ci.cern.ch/week1/cms-externals/clhep/8/48173/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 [RFC] Add tool to automatically update most of ROCm subpackages' versions cms-sw/cmsdist#10080
• @cms-sw Fix for various relocation issues cms-sw/cmsdist#10081
• @cms-sw [hls] Cleanup of C headers e.g. stdlib.h, stdio.h, assert.h cms-sw/cmsdist#10082

You can see more details here:
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-48072b/48173/git-recent-commits.json
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-48072b/48173/git-merge-result

Comparison Summary

Summary:

• You potentially removed 2 lines from the logs
• Reco comparison results: 0 differences found in the comparisons
• DQMHistoTests: Total files compared: 49
• DQMHistoTests: Total histograms compared: 3978581
• DQMHistoTests: Total failures: 46
• DQMHistoTests: Total nulls: 0
• DQMHistoTests: Total successes: 3978515
• DQMHistoTests: Total skipped: 20
• DQMHistoTests: Total Missing objects: 0
• DQMHistoSizes: Histogram memory added: 0.0 KiB( 48 files compared)
• Checked 210 log files, 180 edm output root files, 49 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 cms/v2.4.7.1 IBs (tests are also fine). This pull request will now be reviewed by the release team before it's merged. @sextonkennedy, @mandrenguyen, @ftenchini (and backports should be raised in the release meeting by the corresponding L2)