Linux CI was missing libvulkan-dev, vulkan-tools, and glslc, causing
find_package(Vulkan REQUIRED) to fail. Also update BUILD_INSTRUCTIONS
Ubuntu and Arch sections to include Vulkan/shaderc packages.
- extract_assets.sh: detect Homebrew and pass CMAKE_PREFIX_PATH,
OPENSSL_ROOT_DIR, and PKG_CONFIG_PATH when auto-building on macOS
(bare cmake couldn't find Homebrew deps)
- README.md: fix macOS brew command that had comments after line
continuations (breaks shell execution)
- BUILD_INSTRUCTIONS.md: expand macOS asset extraction section with
auto-build note and expansion targets
- Add missing MSYS2 packages to CI: vulkan-loader, vulkan-headers,
shaderc, stormlib (both x86-64 and arm64), unicorn (arm64)
- Make vulkan-1.dll copy conditional via find_file (fixes MSYS2 builds)
- Use find_library for wininet/bz2 in asset_extract (graceful fallback)
- Add extract_assets.ps1 and extract_assets.bat for Windows users
- Expand BUILD_INSTRUCTIONS.md with MSYS2, vcpkg, and macOS sections
- Update README.md to reference Windows scripts and platforms
