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

Change-Id: I871312c1077439377c67b76112f38b7019fa6fb1
Reviewed-on: https://gerrit.libreoffice.org/67376
Tested-by: Jenkins
Reviewed-by: Miklos Vajna <vmiklos@collabora.com>