...for C-style cast from 'connectivity::ado::OLEString' to 'rtl::OUString', as
connectivity::ado::OLEString has conversion operators to both OUString and BSTR
(i.e., wchar_t*), so both the OUString copy ctor and
OUString(sal_Unicode const*) ctor match.  At least MSVC 2013 happily compiles
that without complaining, but clang-cl does.

Change-Id: Ica634cf19c0fcf1dbff377cb503f6ea6c8257898