build: post-vcpkg cleanup of dead helper files

[tete17]

Summary

Follow-up cleanup to the vcpkg migration. Three small, independent build-system commits that remove dead weight left behind once Conan + the third_party/ vendored deps were retired.

• Remove scripts/update_dependencies.sh — the script managed git-subtree updates for vendored deps under third_party/. After build: migrate from Conan + vendored deps to vcpkg manifest mode #7487 (vcpkg migration), build: generate flatbuffers headers at build time #7488 (flatbuffers from vcpkg), build: replace vendored microtar with libarchive from vcpkg #7495 (microtar → libarchive), and build: unvendor vtzero, provide custom vcpkg overlay #7508 (vtzero unvendored via custom vcpkg overlay), third_party/ is empty and every entry the script knew how to update is now provided by vcpkg. Nothing left to manage — delete the file.
• Remove unused CMake helper files (737 lines deleted across 4 files):
  • cmake/FindTBB.cmake — unused since find_package(TBB CONFIG REQUIRED) resolves via the vcpkg tbb port's TBBConfig.cmake and bypasses Find modules entirely.
  • cmake/FindLua.cmake — an older copy of CMake's upstream module that shadowed the built-in via CMAKE_MODULE_PATH. The vcpkg lua port ships a vcpkg-cmake-wrapper.cmake that redirects find_package(Lua) to unofficial-lua CONFIG and populates LUA_INCLUDE_DIR / LUA_LIBRARIES. Verified by rebuilding osrm_extract (which compiles scripting_environment_lua.cpp) with the file removed.
  • cmake/FindDebArch.cmake — never include()d; CPackConfig.cmake already inlines the equivalent dpkg --print-architecture logic.
  • cmake/cmake_options_script.py — a legacy SublimeClang helper for compile_commands.json consumption, superseded by clangd/LSP.
• Modernise cmake_uninstall.cmake.in — replace constructs deprecated since CMake 3.0 / 3.17 (project already requires 3.18): exec_program → execute_process, cmake -E remove → cmake -E rm -f. Also fix a stringly-typed return-value check (STREQUAL on a stringified int → numeric EQUAL), drop an unused OUTPUT_VARIABLE, and remove the legacy duplicate-condition args on else()/endif()/endforeach() closers. No behaviour change.

Net diff: +10 / -811 across 6 files.

Test plan

• CI green on all platforms (Linux, macOS, Windows)
• cmake --build && cmake --install still produces the expected artefacts
• make uninstall on an installed tree still removes everything in install_manifest.txt

[Copilot]

Pull request overview

This PR removes build-system leftovers that became obsolete after the repository’s migration away from vendored/Conan-managed dependencies toward vcpkg, and lightly modernizes the generated uninstall script to match the project’s current CMake baseline.

Changes:

• Deletes dead maintenance/helpers tied to the old vendored dependency flow (scripts/update_dependencies.sh, cmake/FindTBB.cmake, cmake/FindLua.cmake, cmake/FindDebArch.cmake, cmake/cmake_options_script.py).
• Keeps the active build path intact by relying on the current find_package(... CONFIG ...) / built-in CMake behavior already present in CMakeLists.txt.
• Modernizes cmake_uninstall.cmake.in by replacing deprecated CMake commands with supported equivalents without changing the uninstall target wiring.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
scripts/update_dependencies.sh	Removes obsolete vendored-dependency subtree update script.
cmake/FindTBB.cmake	Deletes unused custom TBB find module; project now uses find_package(TBB CONFIG REQUIRED).
cmake/FindLua.cmake	Deletes shadowing custom Lua find module; project continues through built-in/vcpkg package resolution.
cmake/FindDebArch.cmake	Removes unreferenced Debian architecture helper superseded by cmake/CPackConfig.cmake.
cmake/cmake_uninstall.cmake.in	Updates uninstall script to modern CMake commands and simplified control-flow syntax.
cmake/cmake_options_script.py	Removes legacy editor helper with no remaining in-repo references.

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