INT 62 u - FGDRIVER v3.03 - "FG_POLYLINE" - DRAW AN UNFILLED POLYGON
        AX = 007Ah
        CX = number of vertices in polygon
        ES:BX -> vertex array (see below)
Notes:  For FGDRIVER v1.10, this function was "FG_MOUSEINI" (see AX=0061h);
           "FG_POLYLINE" did not exist yet
        This function is equivalent to "FG_POLYGON", but uses only a single
          array to define the vertices
        This call is ignored in text modes
SeeAlso: AX=0076h,AX=0078h,AX=0079h,AX=007Bh

Format of vertex array element:
Offset  Size    Description
 00h    WORD    column
 02h    WORD    row

.