INT 62 u - FGDRIVER v3.03 - "FG_FLOOD" - FLOOD FILL ARBITRARY CLOSED REGION
        AX = 002Bh
        BX = starting column
        CX = starting row
Desc:   fill the bounded region around the specified point (respecting clipping
          region) with the currrent color
Notes:  For FGDRIVER v1.10, this function was "FG_CLPRECT" (see AX=0011h);
          "FG_FLOOD" did not exist yet
        This function is ignored in text modes
SeeAlso: AX=0026h,AX=006Eh

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