...mainly to demonstrate that its SolarMutexGuard was redundant and that
replacing it with DBG_TESTSOLARMUTEX() would be overkill
Change-Id: I82f00873cd99cb5da1b644c40ba25f8c210503cd
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/132112
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>