Evas: Fixed a few 'implicit declaration' warnings.

Evas: Fixed a few 'implicit declaration' warnings.

    Add missing evas_object_image_source functions.
      (was giving nasty 'implicit declarations' prior to this change)
    Add UNUSED to evas_common_map_rgba for npoints variable
      (wasn't used in that function)
    Fixed a little formatting in evas_object_main.c
    Add UNUSED to the eng_image_map_draw function of the gl_x11 engine.
      (npoints variable not used there)
    Fixed a little formatting in gl_x11 engine.

SVN revision: 56869