Incomplete license header for `src/libImaging/Arrow.h`

### What did you do? Reviewed distributed/bundled files. ### What did you expect to happen? License headers of third-party code are applied correctly. Source most likely is https://github.com/apache/arrow/blob/main/cpp/src/arrow/c/abi.h ### What actually happened? Only a minimal header is included, as well as omitting the corresponding copyright data from the third-party licenses: https://github.com/python-pillow/Pillow/blob/9c1097c861420c77af53c7c9af2a1382e2bfaa8b/src/libImaging/Arrow.h#L4-L6 As the `arrow` project has a `NOTICE.txt` file, this further violates the terms of the Apache-2.0 license: https://github.com/apache/arrow/blob/main/NOTICE.txt Additionally, executed changes have to be specified explicitly - doing a short diff of the file I found versus the file shipped by *Pillow* clearly show omissions and formatting changes. Relevant sections from the license text: https://github.com/apache/arrow/blob/cb7383c71b7c87d45946eec1ba967472592e036b/LICENSE.txt#L98-L122 ### What are your OS, Python and Pillow versions? * OS: irrelevant * Python: irrelevant * Pillow: main