egl: preserve caller state and support surfaceless offscreen contexts - #12
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Summary
Make Coin's offscreen EGL handling safe for applications that already own EGL state and usable in surfaceless environments.
The old Wayland/X11 display-probing fallback is intentionally not restored. Coin honors an explicit surfaceless request, reuses active EGL state when possible, and otherwise follows the normal EGL default-display path.
Stack
Layer 2/18, based on PR #11.