cache LocaleDataWrapper because otherwise we spend quite a bit of time doing function-pointer-symbol lookups. Change-Id: Ic1bd07dabac95a2e1bdad70cffbc2b4cabdc62ed Reviewed-on: https://gerrit.libreoffice.org/c/core/+/183221 Tested-by: Jenkins Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>