catalog backup on windows works

Now the installer creates batchfiles for
db dump and dump delete and configures
the catalog backup job to call them.

Also fixed uninstall so that everything
installed (also psql dlls) are deleted
on uninstall

Signed-off-by: Marco van Wieringen <marco.van.wieringen@bareos.com>
See if enabling hardening on Ubuntu is now fixed.

We remove the unsetting of the LDFLAGS so on Ubuntu it should now start
using the default hardening flags again.