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profiler: Support external SysprofCaptureWriters

Georges Basile Stavracas Neto requested to merge gbsneto/external-capture-writer into master

Using environment variables to control the profiler is limiting, and when it comes to GNOME Shell, it adds an extra level of complexity, since it forces us to start GNOME Shell with the right environment set.

Add support for setting a caller-controlled SysprofCaptureWriter. The header file treats it as a gpointer to avoid including config.h. If an external capture writer is set, it takes precedence over the filename and the file descriptor.

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