*: Fix build and readme in llvm17

[breezewish]

What problem does this PR solve?

Issue Number: ref #6233

Problem Summary:

What is changed and how it works?

Fix README instruction for MacOS
Fix build unit test failure in LLVM17 + MacOS

This doesn't work, so removed: "use CMAKE_C_COMPILER and CMAKE_CXX_COMPILER to specify the compiler"

Check List

Tests

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

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Changes MySQL compatibility

Release note

None

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: JaySon-Huang, Lloyd-Pottiger

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• OWNERS [JaySon-Huang,Lloyd-Pottiger]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-11-20 03:15:19.060098279 +0000 UTC m=+1506.679752795: ☑️ agreed by Lloyd-Pottiger.
• 2024-11-20 03:32:13.272078789 +0000 UTC m=+2520.891733305: ☑️ agreed by JaySon-Huang.

[JinheLin]

/retest

[ti-chi-bot]

@breezewish: Your PR was out of date, I have automatically updated it for you.

At the same time I will also trigger all tests for you:

/run-all-tests

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[JaySon-Huang]

happen to unstable test: #9662

[JaySon-Huang]

/test pull-unit-test