vlc_arrays: refactor foreach loop

vlc_arrays: refactor foreach loop

Replace:

    FOREACH_ARRAY(item, array)
       // ...
    FOREACH_END()

by:

    ARRAY_FOREACH(item, array)
    {
        // ...
    }

Note that it is not possible to declare the iteration variable directly
anymore:

    ARRAY_FOREACH(void *item, array)

Instead, use:

    void *item;
    ARRAY_FOREACH(item, array)

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>