INT 62 u - FGDRIVER v3.03 - "FG_POLYGON" - DRAW AN UNFILLED POLYGON
        AX = 0079h
        CX = number of vertices in polygon
        ES:BX -> variable pointer record (see below)
Notes:  For FGDRIVER v1.10, this function was "FG_INTJOY" (see AX=0050h);
           "FG_POLYGON" was AX=002Eh
        This call is ignored in text modes
SeeAlso: AX=0078h,AX=007Ah,AX=007Bh

Format of variable pointer record:
Offset  Size    Description
 00h    WORD    segment of WORD array containing vertex columns
 02h    WORD    offset of WORD array containing vertex columns
 04h    WORD    segment of WORD array containing vertex rows
 06h    WORD    offset of WORD array containing vertex rows

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