[staging-next] arrow-cpp: 18.0.0 -> 18.1.0; add boost 187 patch

[paparodeo]

https://github.com/apache/arrow/releases/tag/apache-arrow-18.1.0
apache/arrow#45057
https://hydra.nixos.org/build/284701371

Things done

• Built on platform(s)
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• For non-Linux: Is sandboxing enabled in nix.conf? (See Nix manual)
  • sandbox = relaxed
  • sandbox = true
• Tested, as applicable:
  • NixOS test(s) (look inside nixos/tests)
  • and/or package tests
  • or, for functions and "core" functionality, tests in lib/tests or pkgs/test
  • made sure NixOS tests are linked to the relevant packages
• Tested compilation of all packages that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review rev HEAD". Note: all changes have to be committed, also see nixpkgs-review usage
• Tested basic functionality of all binary files (usually in ./result/bin/)
• 25.05 Release Notes (or backporting 24.11 and 25.05 Release notes)
  • (Package updates) Added a release notes entry if the change is major or breaking
  • (Module updates) Added a release notes entry if the change is significant
  • (Module addition) Added a release notes entry if adding a new NixOS module
• Fits CONTRIBUTING.md.

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[FliegendeWurst]

For reference, the error is

FAILED: src/arrow/CMakeFiles/arrow_testing_objlib.dir/testing/process.cc.o
/nix/store/cfncx7a496zhh9f98qdzidq3shzl1an9-gcc-wrapper-14-20241116/bin/g++ -DARROW_EXTRA_ERROR_CONTEXT -DARROW_HAVE_RUNTIME_AVX2 -DARROW_HAVE_RUNTIME_AVX512 -DARROW_HAVE_RUNTIME_BMI2 -DARROW_HAVE_RUNTIME_SSE4_2 -DARROW_HAVE_SSE4_2 -DAR>
/build/source/cpp/src/arrow/testing/process.cc:88:18: error: 'BOOST_PROCESS_V2_ASIO_NAMESPACE' is not a namespace-name
   88 | namespace asio = BOOST_PROCESS_V2_ASIO_NAMESPACE;
      |                  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/build/source/cpp/src/arrow/testing/process.cc:246:3: error: 'asio' does not name a type
  246 |   asio::io_context ctx_;
      |   ^~~~
/build/source/cpp/src/arrow/testing/process.cc: In member function 'arrow::Status arrow::util::Process::Impl::ExecuteV2()':
/build/source/cpp/src/arrow/testing/process.cc:296:30: error: 'ctx_' was not declared in this scope
  296 |         new process::process(ctx_, executable_, args_, env,
      |                              ^~~~

Still building this version, no errors yet.