ixus110_sd960 1.00b: enabled autobuild (report: http://chdk.setepontos.com/index.php?topic=9133.msg96620#msg96620)
Remove redundant CAM_ZEBRA_ASPECT_ADJUST #define (equivalent to CAM_USES_ASPECT_CORRECTION).
Enable DRAW_ON_ACTIVE_BITMAP_BUFFER_ONLY for G12, G1X, IXUS310, SX30 & SX40 (speeds up CHDK OSD).
Clean up gui_draw.c code when using DRAW_ON_ACTIVE_BITMAP_BUFFER_ONLY.
SX220

* Remove vid_get_viewport_fb(), vid_get_viewport_live_fb(), vid_get_bitmap_fb() in sub/lib.c and add in platform/lib.c
* Enable #define DRAW_ON_ACTIVE_BITMAP_BUFFER_ONLY
* Reorganized platform_camera.h