Add revision 1.15 from xsrc version:

date: 2013-01-31 12:18:01 +0100; author: macallan; state: Exp; lines: +145 -72;
use WSDISPLAYIO_GET_FBINFO if available

... with slight adaptations to the pkgsrc version (xalloc vs. malloc,
struct wsdisplay_fbinfo vs wsdisplayio_fbinfo).

(Less likely to display blue skin and red sky this way.)

(is)