Since it is now possible to use C++14, it's time to replace
the temporary solution with the standard one

Change-Id: Ib3201f865d43f372007cdf381c7e244e9cbeae26
Reviewed-on: https://gerrit.libreoffice.org/67474
Tested-by: Jenkins
Reviewed-by: Miklos Vajna <vmiklos@collabora.com>