engine: d52af905437b broke pas2c build. pas2c doesn't understand "in [1, 2]" etc. PS: pas2c possibly still fails due to physfs issues :/

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

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