MetaRendererNative: Properly handle EGLOutput acquire errors

Whenever an EGLOutput consumer is temporary unable to handle
eglStreamConsumerAcquire() operations (e.g. during a VT-switch),
an EGL_RESOURCE_BUSY_EXT error is generated.

This change adds the appropriate error handling to flip_egl_stream() in
order to recover from such errors.

https://bugzilla.gnome.org/show_bug.cgi?id=779112