See the mail sub-thread starting at
<https://lists.freedesktop.org/archives/libreoffice/2017-October/078609.html>
"Re: C[++]: Normalizing include syntax ("" vs <>)".

Change-Id: Ibb636be643789d455e771fcd54913dd3cdd03815
Reviewed-on: https://gerrit.libreoffice.org/43284Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>