Currently firebird uses /tmp and C://temp/ as default temporary directories,
both of which can be incorrect. Instead we now pass the correct temp
directories to firebird.

Change-Id: I807a47475e76600365e7a2ccfa78d755621dedb7
Reviewed-on: https://gerrit.libreoffice.org/5678Reviewed-by: Tor Lillqvist <tml@iki.fi>
Tested-by: Tor Lillqvist <tml@iki.fi>