MSC: short _pie( short control, short x1, short y1, short x2,
			 short y2, short x3, short y3, short x4, short y4 )

	MSC: short far _pie_wxy( short ctl,
			   struct _wxycoord far *pwxy1,
			   struct _wxycoord far *pwxy2,
			   struct _wxycoord far *pwxy3,
			   struct _wxycoord far *pwxy4 )

	- prototype in graph.h

	- (x1, y1) upper left rectangle corner
	- (x2, y2) lower right rectangle corner
	- (x3, y3) start of vector
	- (x4, y4) end of vector
	- ctl = _GFILLINTERIOR	fills region with current color and mask
		_GBORDER  don't fill region

	- returns nonzero value on success; zero otherwise