Self-built ANGLE bundle for Q2PRO-X `win32egl` backend.

Purpose:
- portable runtime for Windows `win32egl`
- keeps the EGL/ANGLE windowing path that behaves better for alt-tab / capture
- 2026-05-30 refresh enables the ANGLE Vulkan backend so modern GPUs can expose
  GLES 3.1/3.2 capabilities such as SSBOs and buffer textures
- D3D11 remains available as a compatibility fallback, but this ANGLE revision is
  capped at GLES 3.0 on D3D11

Files bundled next to `Q2PRO-X.exe`:
- `libEGL.dll`
- `libGLESv2.dll`
- `d3dcompiler_47.dll`
- `vulkan-1.dll`

Built from:
- ANGLE checkout: `O:\Claude2\angle_checkout`
- output dir: `O:\Claude2\angle_checkout\out\ReleaseMsvcVulkan`

Build args:
- `is_debug=false`
- `is_component_build=false`
- `is_clang=false`
- `use_custom_libcxx=false`
- `use_custom_libcxx_for_host=false`
- `clang_use_chrome_plugins=false`
- `angle_assert_always_on=false`
- `angle_enable_d3d9=false`
- `angle_enable_d3d11=true`
- `angle_enable_vulkan=true`
- `angle_enable_gl=false`
- `symbol_level=0`
- `enable_rust=false`

Q2PRO-X usage:
- default: `vid_driver win32egl; gl_angle_backend auto`
- force modern ANGLE Vulkan path: `gl_angle_backend vulkan; vid_restart`
- force compatibility D3D11 path: `gl_angle_backend d3d11; vid_restart`
- restore old video backend: `vid_driver win32wgl`

Backup of the previous D3D11-only ANGLE bundle:
- `O:\Claude2\q2pro-release\angle_backup_2026-05-30_es30_d3d11`
