try copy libnsl.so to INSTALL_DIR

[solotzg]

What problem does this PR solve?

Issue Number: close #2752

Problem Summary:

What is changed and how it works?

What's Changed:

• try copy libnsl.so to ${INSTALL_DIR}

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Side effects

Release note

Fix the issue that TiFlash fails to start up under platform without library `nsl`

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• birdstorm

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[solotzg]

/run-all-tests

[birdstorm]

LGTM

[solotzg]

/merge

[ti-chi-bot]

@solotzg: It seems you want to merge this PR, I will help you trigger all the tests:

/run-all-tests

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[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: bb83554

[ti-chi-bot]

In response to a cherrypick label: new pull request created: #3205.

[ti-chi-bot]

In response to a cherrypick label: new pull request created: #3206.

[ti-chi-bot]

In response to a cherrypick label: new pull request created: #3207.

[ti-chi-bot]

In response to a cherrypick label: new pull request created: #3209.

[ti-chi-bot]

In response to a cherrypick label: new pull request could not be created: failed to create pull request against pingcap/tics#release-4.0 from head ti-chi-bot:cherry-pick-3203-to-release-4.0: status code 422 not one of [201], body: {"message":"Validation Failed","errors":[{"resource":"PullRequest","code":"custom","message":"A pull request already exists for ti-chi-bot:cherry-pick-3203-to-release-4.0."}],"documentation_url":"https://docs.github.com/rest/reference/pulls#create-a-pull-request"}