INT 62 u - FGDRIVER v3.03 - "FG_POLYOFF" - DEFINE POLYGON DRAWING OFFSET
        AX = 007Bh
        BX = horizontal offset (default 0)
        CX = vertical offset (default 0)
Desc:   define the offsets applied to all vertices of polygons drawn with
          "FG_POLYFILL" or "FG_POLYLINE"
Note:   For FGDRIVER v1.10, this function was "FG_MOUSEVIS" (see AX=0067h);
           "FG_POLYOFF" did not exist yet
SeeAlso: AX=0078h,AX=007Ah

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