PipeWire: support Directory Reference

PipeWire 0.3.37

support Directory Reference
Directory dependency graph for support:

## Files
file | cpu.h [code]
file | dbus.h [code]
file | build/doc/spa/support/i18n.h [code]
file | log-impl.h [code]
file | build/doc/spa/support/log.h [code]
file | build/doc/spa/support/loop.h [code]
file | plugin-loader.h [code]
file | plugin.h [code]
file | system.h [code]
file | build/doc/spa/support/thread.h [code]