[C++][Gandiva] Accept LLVM 15

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The MinGW C++ builds have started failing very recently with (seemingly) unrelated CMake configuration failures. Example:
https://github.com/apache/arrow/actions/runs/3052791203/jobs/4922591671

This is happened MSYS2 provides LLVM 15 and Apache Arrow C++ doesn't accept LLVM 15 yet.

Reporter: Antoine Pitrou / @pitrou
Assignee: Jin Shang / @js8544

Related issues:

• [C++][Gandiva] Adapt to LLVM opaque pointer (is related to)

PRs and other links:

• GitHub Pull Request #14125

_{Note: This issue was originally created as ARROW-17728. Please see the migration documentation for further details.}

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Antoine Pitrou / @pitrou:
cc @kou

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Jin Shang / @js8544:
I think it's because MSYS2 updated its LLVM version to 15.0.0 a few days ago msys2/MINGW-packages@babbba3 and arrow doesn't accept LLVM 15 yet. I'll submit a PR to fix this.

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Kouhei Sutou / @kou:
Right. We need to add support for LLVM 15 like ARROW-16105, ARROW-14364 and so on.

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Kouhei Sutou / @kou:
Issue resolved by pull request 14125
#14125