tesseract: ensure fixupPhase is run, e.g. ensuring library codesigning on darwin

[elohmeier]

Since the tesseract wrapper replaces the phases in tesseractBase with it's buildCommand, this prevents running e.g. the fixupPhase which would codesign the modified library for darwin.
This change ensures the fixupPhase is executed, ensuring a valid code signature for libtesseract.5.dylib.

Before the change:

$ nix-build -A tesseract5.tesseractBase
/nix/store/5f9hf5d2lgdkb44x60khx5b2cm50xyv5-tesseract-5.3.4
$ codesign -vvv result/lib/libtesseract.5.dylib
result/lib/libtesseract.5.dylib: valid on disk
result/lib/libtesseract.5.dylib: satisfies its Designated Requirement

$ nix-build -A tesseract5
/nix/store/zxmnplp54g4iks4h9hrllfrd2rlbbj20-tesseract-5.3.4
$ codesign -vvv result/lib/libtesseract.5.dylib
result/lib/libtesseract.5.dylib: invalid signature (code or signature have been modified)
In architecture: arm64

After the change:

$ nix-build -A tesseract5.tesseractBase
/nix/store/5f9hf5d2lgdkb44x60khx5b2cm50xyv5-tesseract-5.3.4
$ codesign -vvv result/lib/libtesseract.5.dylib
result/lib/libtesseract.5.dylib: valid on disk
result/lib/libtesseract.5.dylib: satisfies its Designated Requirement

$ nix-build -A tesseract5
/nix/store/zxmnplp54g4iks4h9hrllfrd2rlbbj20-tesseract-5.3.4
$ codesign -vvv result/lib/libtesseract.5.dylib
result/lib/libtesseract.5.dylib: valid on disk
result/lib/libtesseract.5.dylib: satisfies its Designated Requirement

Fixes #350072.

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/)
• 24.11 Release Notes (or backporting 23.11 and 24.05 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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