kf5be: Make fromQStringToOUString work for Qt 6 HEADmaster

Sync `fromQStringToOUString` with the `toOUString`
implementation in `vcl/inc/qt5/QtTools.hxx`, which
makes it work with Qt 6 as well.

Without this, building this with a planned upcoming
change that introduces a KF 6 desktop backend would fail
like this:

In file included from /home/user/development/git/libreoffice/shell/source/backends/kf6be/kfaccess.cxx:10:
/home/user/development/git/libreoffice/shell/source/backends/kf6be/../kf5be/kfaccess.cxx:53:60: error: non-constant-expression cannot be narrowed from type 'qsizetype' (aka 'long long') to 'sal_Int32' (aka 'int') in initializer list [-Wc++11-narrowing]
53 |     return { reinterpret_cast<char16_t const*>(s.utf16()), s.size() };
|                                                            ^~~~~~~~
/home/user/development/git/libreoffice/shell/source/backends/kf6be/../kf5be/kfaccess.cxx:53:60: note: insert an explicit cast to silence this issue
53 |     return { reinterpret_cast<char16_t const*>(s.utf16()), s.size() };
|                                                            ^~~~~~~~
|                                                            static_cast<sal_Int32>( )

Change-Id: Ic2b1ddcaa290379187db69b33e4a700c148650e1
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/168275
Tested-by: Jenkins
Reviewed-by: Michael Weghorn <m.weghorn@posteo.de>

0 files changed, 0 insertions, 0 deletions