Cell: Remove erroneous ALIGN16_ATTRIB attributes

If a structure is marked as being aligned the SPE compiler performs
extra optimizations (sadly, only -O2 is used) when reading the
structure.  Since most of the structures sent in batch buffers are
only 8-byte aligned, this resulted in mysterous bugs with -O2.

src/gallium/drivers/cell/common.h

    uint pitch;         /**< Byte pitch from one entry to the next. */
    uint size;
    uint function_offset;
-} ALIGN16_ATTRIB;
+};
 
 
 struct cell_attribute_fetch_code {
    unsigned num_declarations;
    unsigned num_instructions;
    unsigned num_immediates;
-} ALIGN16_ATTRIB;
+};
 
 
 #define SPU_VERTS_PER_BATCH 64
    float plane[12][4];
    unsigned nr_planes;
    unsigned nr_attrs;
-} ALIGN16_ATTRIB;
+};
 
 
 struct cell_command_render