Same as RAND() and RANDBETWEEN() but not recalculating on every
change, just the normal expression recalculation.
Change-Id: I8ba7099125e487a78bd3d91db8b666c2f36b22fd
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/92994
Tested-by: Jenkins
Reviewed-by: Eike Rathke <erack@redhat.com>