The ornamental design for a vehicleheadlight, as shown and described.
FIG. 1 is a front view of a vehicle headlight showing my new design;
FIG. 2 is a front left perspective view thereof; and,
FIG. 3 is a left side view thereof.
The broken line(s) which define the bounds of the claimed design form no part thereof. Outside the broken line boundary, the de-emphasized and halftone showing of a motor vehicle illustrates environment and forms no part of the claimed design.