libweston: Add weston_log_paced()
We have a few places where we log messages only the first time they occur.
Add a throttled logging facility that allows logging N events in M ms, and replace most of these open coded log-once sites.
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We have a few places where we log messages only the first time they occur.
Add a throttled logging facility that allows logging N events in M ms, and replace most of these open coded log-once sites.