libweston: Use weston_signal_emit_mutable for all destroy signals
A left over from our switch to weston_signal_emit_mutable().
Signed-off-by: Marius Vlad marius.vlad@collabora.com
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A left over from our switch to weston_signal_emit_mutable().
Signed-off-by: Marius Vlad marius.vlad@collabora.com