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/).

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void fpcrtl_halt(int num) {

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    __coverity_panic__();

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}

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int fpcrtl_abs(int num) {

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    return num >= 0 ? num : -num;

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}