Fix `-Waggressive-loop-optimizations`
Fix `-Waggressive-loop-optimizations`

* fmopl.c:607:20: warning: iteration 15 invokes undefined behavior [-Waggressive-loop-optimizations]
     OPL->AR_TABLE[i] = EG_AED-1;
     ~~~~~~~~~~~~~~~~~^~~~~~~~~~
  fmopl.c:605:2: note: within this loop
    for (i = 60;i < 76;i++)
    ^~~
* AR_TABLE is defined as an INT32[75] array, and overrunning
  the bounds invokes undefined behavior.

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