The ornamental design for a bunionsplint, as shown and described.
FIG. 1 is a perspective view of a first side of a bunion splint of the present design in a position of use on a wearer's foot;
FIG. 2 is a perspective, in use view of the second side thereof;
FIG. 3 is a plan view of the second side thereof in a flat state; and,
FIG. 4 is a plan view of the first side thereof in a flat state.
The broken line showing of a human foot in FIG. 1 and FIG. 2 is for the purpose of depicting environment and forms no part of the claim. All other broken lines are for the purpose of depicting stitching and form no part of the claim.