Fix sinegun dealing 1 damage when shooting straight up. Reduces sine gun knockback strength by 1.25% This was caused by AmmoShove, which had a strenght which was *right* above the threshold for fall damage.

void fpcrtl_halt(int num) {
    __coverity_panic__();
}

int fpcrtl_abs(int num) {
    return num >= 0 ? num : -num;
}