Allow non-English for program names; useful w/ -e

    The old code used Latin1() to check program names and also used
    QFile::encodeName().

    Thanks to Eugene Shalygin for report and research.

    Example:
    cp `which vi` ./编辑器
    konsole -e ./编辑器
    BUG: 297529
    FIXED-IN: 2.8.3

cherry-picked from 3ceb3246