Merge change I56981989 into eclair

void point4__mvui(transform_t const* mx, vec4_t* lhs, vec4_t const* rhs) {

    // this used for transforming light positions back to object space.

    // Lights have 3 components positions, so w is always 1.

    // however, it is used as a switch for directional lights, so we need

    // w is used as a switch for directional lights, so we need

    // to preserve it.

    const GLfixed* const m = mx->matrix.m;

    const GLfixed rx = rhs->x;

    const GLfixed ry = rhs->y;

    const GLfixed rz = rhs->z;

    lhs->x = mla3a(rx, m[ 0], ry, m[ 4], rz, m[ 8], m[12]); 

    lhs->y = mla3a(rx, m[ 1], ry, m[ 5], rz, m[ 9], m[13]);

    lhs->z = mla3a(rx, m[ 2], ry, m[ 6], rz, m[10], m[14]);

    lhs->w = rhs->w;

    const GLfixed rw = rhs->w;

    lhs->x = mla4(rx, m[ 0], ry, m[ 4], rz, m[ 8], rw, m[12]);

    lhs->y = mla4(rx, m[ 1], ry, m[ 5], rz, m[ 9], rw, m[13]);

    lhs->z = mla4(rx, m[ 2], ry, m[ 6], rz, m[10], rw, m[14]);

    lhs->w = rw;

}

void point2__nop(transform_t const*, vec4_t* lhs, vec4_t const* rhs) {

    lhs->z = 0;

    lhs->w = 0x10000;