* c-decl.c (start_struct): Ensure that structs with forward
        declarations are in fact packed when -fpack-struct is given.

        * stor-layout.c (layout_record): Ignore STRUCTURE_SIZE_BOUNDARY if
        we are packing a structure.  This allows a structure with only
        bytes to be aligned on a byte boundary and have no padding on a
        m68k.

From-SVN: r15939