base

Ensure alignment of Res_png_9patch.

This doesn't alter the alignment of the data within the struct, but
enforces that this structure will be appropriately aligned when used.

The image_info struct has this struct preceded by a bool, which causes
odd alignment for the members of this struct.

Change-Id: Ia2ef5c81b2f961c0f61858a10a7821d82f600919