[9fans] structure allocation.

[erik quanstrom]

the open-source drivers for the DAC960 have a number
of structures declared like

typedef struct {
        char f;
        ulong l;
        char g;
        ulong m;
} __attribute__((packed)) Dac960fu;

with comments such as:

/*
 * Command result buffers, as placed in system memory by the controller.
 */

how is this handled in plan 9?

- erik