raylib: add PLATFORM_OFFSCREEN support (#38)

* raylib: add PLATFORM_OFFSCREEN support for headless CI rendering

- build.sh: use commaai/raylib platform-offscreen commit, build offscreen
  variant (libraylib_offscreen.a) alongside desktop for x86_64, bundle
  GLVND dispatchers (libEGL, libOpenGL, libGLdispatch) in install/lib/mesa/
- build.py: add PLATFORM_OFFSCREEN elif — uses offscreen lib + bundled
  GLVND with RPATH, links -lOpenGL -lEGL instead of -lGL -lX11
- __init__.py: auto-rebuild CFFI when RAYLIB_PLATFORM env changes
  (tracks built platform in .raylib_platform marker file)
- Bump version to 5.5.0.5

This lets openpilot CI render headlessly via EGL surfaceless + Mesa
llvmpipe without needing xvfb or any additional apt packages.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* raylib: auto-detect CI and use PLATFORM_OFFSCREEN

__init__.py now auto-detects CI on Linux x86_64 and uses
PLATFORM_OFFSCREEN + LIBGL_ALWAYS_SOFTWARE=1 automatically.
No env vars needed in the consuming CI workflow.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

raylib/pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "raylib"
-version = "5.5.0.4"
+version = "5.5.0.5"
 description = "raylib + pyray Python bindings (commaai fork)"
 requires-python = ">=3.8"
 dependencies = ["cffi>=1.17.1"]