The ornamental design for a vehicleheadlight, as shown and described.
FIG. 1 is a perspective front view of a vehicle headlight in environmental conditions showing my new design;
FIG. 2 shows a perspective side view thereof;
FIG. 3 shows a front view thereof;
FIG. 4 shows a top plan view thereof;
FIG. 5 shows a bottom plan view thereof;
FIG. 6 shows a left side view thereof; and,
FIG. 7 shows a right side view thereof.
The broken lines of the figures showing additional portions of the vehicle are included for the purpose of illustrating environmental structure and form no part of the claimed design.