Fix PX4 toolchain build on macOS (Intel & Apple Silicon / Rosetta) by updating formula flags

[pawelpetruch]

This PR updates several PX4 Homebrew formulas (asio@1.10.8, fastcdr, foonathan-memory, fastdds) to improve compatibility with modern macOS toolchains, especially on Apple Silicon running under Rosetta 2.

Key changes

• Consistent C++ standard
  Enforces -DCMAKE_CXX_STANDARD=14 (or higher) and disables compiler extensions for all formulas.

• macOS-specific safety flags
  On macOS, explicitly sets:
  stdlib=libc++
isysroot $(xcrun --sdk macosx --show-sdk-path)
I$(SDK)/usr/include/c++/v1
DCMAKE_OSX_ARCHITECTURES=x86_64 (ensures Rosetta builds work correctly)

• Boost / Asio fix
  Pre-seeds ac_cv_header_boost_noncopyable_hpp=yes in asio@1.10.8 to bypass fragile header detection on macOS.

• CMake policies
  Adds -DCMAKE_POLICY_VERSION_MINIMUM=3.5 consistently to silence compatibility warnings.

• Disabled unnecessary components
  For fastdds, disables tests, examples, and tools to speed up builds and reduce dependencies.

Why this is needed
Without these changes:

• Build fails with errors like fatal error: 'string' file not found or std::atomic not supported.
• PX4 toolchain installation via brew install px4/px4/px4-dev is broken on current macOS setups.

Tested on

• macOS Sonoma 15.x (Intel shell under Rosetta, Homebrew under /usr/local)

Verified working toolchain install via:
HOMEBREW_NO_AUTO_UPDATE=1 brew install px4/px4/px4-dev

[pawelpetruch]

Related to: #98

[mrpollo]

Is this not working for you without Rosetta? Or are you just trying to add one more option?