We want it to be possible to compile an arbitrary subset of the source
files for debugging. DBG_UTIL, on the other hand, has to be consistent
across the whole build. We should not use OSL_DEBUG_LEVEL to switch
(internal) API on/off.

Change-Id: Ia5111a36326ad7ad4c72d9e8f7ad88c8dbe8e272
Reviewed-on: https://gerrit.libreoffice.org/72616
Tested-by: Jenkins
Reviewed-by: Tor Lillqvist <tml@collabora.com>