qbsp: DividePlane: add missing recalculation of surface bbox for the parallel case.

Thanks to rebb for the idea, txqbsp has the workaround in SelectPartition that recomputes the surface bbox; I think this fixes the underlying bug though.

Note: this makes telefragged.map (from the RRP devkit) leak in hull 2.
However, the point file starts at a func_detail staircase that, if turned into func_wall, fixes the leak.

qbsp/solidbsp.c

@@ -524,6 +524,17 @@ DividePlane(surface_t *in, plane_t *split, surface_t **front,
 		}
 	    }
 
+	    // ericw -- added these CalcSurfaceInfo to recalculate the surf bbox.
+	    // pretty sure their omission here was a bug.
+	    // It's tied to options.maxNodeSize because that change needs
+	    // valid bboxes to work well (txqbsp-xt calculated the node bbox from
+	    // faces in SelectPartition)
+	    if (options.maxNodeSize >= 64) {
+		// recalc bboxes and flags
+		CalcSurfaceInfo(newsurf);
+		CalcSurfaceInfo(in);
+	    }
+
 	    if (in->faces)
 		*front = in;
 	    else