log: Add a flags parameter to _srt_util_set_glib_log_handler
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log: Add a flags parameter to _srt_util_set_glib_log_handler
We can use this to set up different types of logging with a single log handler, which will make it easier to add new flags, such as a flag to make the log more deterministic to minimize diff.
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log: Read SRT_LOG environment variable
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log: Add a flag to make the log easier to compare
This disables performance profiling (timing) and removes the process ID from log messages, unless overridden by more specific flags.