The ornamental design for a vehicleheadlight, as shown and described.
FIG. 1 is a perspective view of a vehicle headlight showing my present design;
FIG. 2 is a front view thereof;
FIG. 3 is a left view thereof;
FIG. 4 is a top plane view thereof; and,
FIG. 5 is another perspective view thereof.
The dashed lines in the drawings illustrate portions of the vehicle headlight which form no part of the claimed design.
The dashed-dotted lines in the drawings depict portions of a vehicle body which represent environmental structure and form no part of the claimed design.