Bug 721576 - Gnucash can not work with files, that have russian symbols in path.

g_win32_locale_filename_from_utf8() is not only unnecessary, it does the
wrong thing.

git-svn-id: svn+ssh://svn.gnucash.org/repo/gnucash/trunk@23700 57a11ea4-9604-0410-9ed3-97b8803252fd