Fix the sound issues and crashes on some platforms This commit updates misc/libphyslayer/physfsrwops.* files to the latest versions provided by PhysFS project (https://github.com/icculus/physfs/tree/main/extras/).

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

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