...in case there are multiple, as is the case at least with recent (towards
GCC 8) libstdc++, where std::pair is forward-declared also in
include/c++/8.0.0/bits/stl_iterator.h, so that in
dbaccess/source/ui/dlg/DbAdminImpl.cxx

    std::pair< Reference<XConnection>,sal_Bool> aRet;
    aRet.second = false;

failed to reconstruct the sal_Bool template argument and issued a
loplugin:implicitboolconversion warning.

Change-Id: I0054f2596d3f8837b857f1dca2f25952828b12cc
Reviewed-on: https://gerrit.libreoffice.org/45254Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>