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

Change-Id: Ic91b7170b10299001167e78ade1d24c16ce9319e
Reviewed-on: https://gerrit.libreoffice.org/67475
Tested-by: Jenkins
Reviewed-by: Miklos Vajna <vmiklos@collabora.com>