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>