meson: build an :all bottle

There are still some stray `/usr/local` and `/opt/homebrew` references
that we can make the same across all our bottles.

Formula/m/meson.rb

@@ -32,18 +32,26 @@ def install
  # Make the bottles uniform. This also ensures meson checks `HOMEBREW_PREFIX`
  # for fulfilling dependencies rather than just `/usr/local`.
  mesonbuild = prefix/Language::Python.site_packages(python3)/"mesonbuild"
- inreplace_files = %w[
+ usr_local_files = %w[
  coredata.py
+ options.py
  dependencies/boost.py
  dependencies/cuda.py
  dependencies/qt.py
  scripts/python_info.py
  utils/universal.py
+ compilers/mixins/apple.py
  ].map { |f| mesonbuild/f }
- inreplace_files << (bash_completion/"meson")
+ usr_local_files << (bash_completion/"meson")
 
  # Passing `build.stable?` ensures a failed `inreplace` won't fail HEAD installs.
- inreplace inreplace_files, "/usr/local", HOMEBREW_PREFIX, build.stable?
+ inreplace usr_local_files, "/usr/local", HOMEBREW_PREFIX, audit_result: build.stable?
+
+ opt_homebrew_files = %w[dependencies/boost.py compilers/mixins/apple.py].map { |f| mesonbuild/f }
+ inreplace opt_homebrew_files, "/opt/homebrew", HOMEBREW_PREFIX, audit_result: build.stable?
+
+ # Ensure meson uses our `var` directory.
+ inreplace mesonbuild/"options.py", "'/var/local", "'#{var}", audit_result: build.stable?
  end
 
  test do