[Backport release/3.9] Miramon: avoid Unsigned-integer-overflow in MMCreateExtendedDBFIndex() #9786
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Validate that FirstRecordOffset as computed in
MM_ReadExtendedDBFHeaderFromFile() is not negative. Otherwise it gets
later passed to MMCreateExtendedDBFIndex() which casts it to a uint64_t,
and thus lead to unsigned integer overflow when doing:
```
fseek_function(f,
(MM_FILE_OFFSET)offset_1era +
(MM_FILE_OFFSET)bytes_acumulats_id_grafic,
SEEK_SET);
```
Fixes https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=68303
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Backport #9776
Authored by: @rouault