...in CppunitTest_dbaccess_firebird_test.  Otherwise, the test would fail with

> Test name: FirebirdTest::testEmptyDBConnection
> An uncaught exception of type com.sun.star.sdbc.SQLException
> - The connection can not be established. No storage or URL was given.

if dbaccess/qa/unit/data/firebird_empty.odb is read-only, as
DocumentStorageAccess::impl_openSubStorage_nothrow
(dbaccess/source/core/dataaccess/ModelImpl.cxx) takes
m_pModelImplementation->m_bDocumentReadOnly into account and returns a null
xStorage.

Adds a move ctor to utl::TempFile (thus causing copy ctor and copy assignment op
to be implicitly deleted), but leaves any move assignment op undeclared for now,
as none happens to be needed (yet).

Change-Id: I6f9eff07eb54f1364a0560ffa4cf1f676a319d16
Reviewed-on: https://gerrit.libreoffice.org/46561Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>