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screencast: Use fences to avoid stalling the graphics pipeline

Vlad Zahorodnii requested to merge work/screencast-fencing into master

Currently, we use glFinish() to ensure that stream consumers don't see corrupted or rather incomplete buffers. This is a serious issue because glFinish() not only prevents the gpu from processing new GL commands, but it also blocks the compositor.

This change addresses the blocking issue by using native fences. With the proposed change, after finishing recording a frame, a fence is inserted in the command stream. When the native fence is signaled, the pending pipewire buffer will be enqueued.

If the EGL_ANDROID_native_fence_sync extension is not supported, we'll fall back to using glFinish().

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