[I] Multiple test failures on PowerPC (big endian), on 15.0.2 [arrow]

["mgorny (via GitHub)" <gi...@apache.org>]

mgorny opened a new issue, #40764:
URL: https://github.com/apache/arrow/issues/40764

   ### Describe the bug, including details regarding any error messages, version, and platform.
   
   When running the test suite on Gentoo PowerPC (POWER9), I'm getting the following test failures:
   
   ```
   The following tests FAILED:
            18 - arrow-compute-internals-test (Failed)
            25 - arrow-utility-test (Failed)
            40 - parquet-internals-test (Failed)
            41 - parquet-reader-test (Failed)
            43 - parquet-arrow-test (Failed)
            44 - parquet-arrow-internals-test (Failed)
            45 - parquet-encryption-test (Failed)
            46 - parquet-encryption-key-management-test (Failed)
   Errors while running CTest
   ```
   
   Build log: [build.txt](https://github.com/apache/arrow/files/14731364/build.txt)
   Test log: [test.txt](https://github.com/apache/arrow/files/14731370/test.txt)
   
   Some of them clearly look like endianness issues, others are unclear to me.
   
   ### Component(s)
   
   C++


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