Reexported `vec2_mul_scalar`
Reexported `vec2_mul_scalar`

Closes https://github.com/PistonDevelopers/graphics/issues/655

aepsil0n/graphics,stjahns/graphics,mitchmindtree/graphics,bvssvni/graphics,andrewcsmith/graphics,echochamber/graphics,Vinatorul/graphics,PistonDevelopers/graphics