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

Change-Id: I6eea0877eaa1886b64c0cce06a43b8088cbccd8e
Reviewed-on: https://gerrit.libreoffice.org/66751
Tested-by: Jenkins
Reviewed-by: Miklos Vajna <vmiklos@collabora.com>