And also address a few new warnings in sal, plus silence such warnings
in salhelper till we can't print typeids out of the box.

Change-Id: I38049146710b6885f6a874bf74eedbc38b4d4651
Reviewed-on: https://gerrit.libreoffice.org/29809Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>
Tested-by: Jenkins <ci@libreoffice.org>