fc0d57b7af
This reverts commit 05050cdb23,
not all places that use e.g. OStringToOUString to convert potential UTF-8
are guaranteed to fulfil the prerequisites necessary to use fromUtf8 (and
some places like e.g. in codemaker are happy with the best-effort effect
of OStringToOUString's OSTRING_TO_OUSTRING_CVTFLAGS).