Files are never truncated

[jcreedcmu]

Steps to reproduce:

• Open a file with TESample
• Change some of its contents, but make the new file shorter
• File > Save
• Close file and reopen it. Observe:
• The content that was changed stays changed, but the content that should be truncated is still there.

It seems that whenever we save a file, even when we do

OSErr writeFile(TEHandle te, FSSpec *spec) {
  OSErr err;
  short refNum;
  err = FSpOpenDF(spec, fsRdWrPerm, &refNum);
  Handle textHandle = (Handle)TEGetText(te);
  long size = (*te)->teLength;
  err = SetFPos(refNum, fsFromStart, 0);
  err = FSWrite(refNum, &size, *textHandle);
  err = SetEOF(refNum, size);
  err = FSClose(refNum);
  return err;
}

the EOF of the file is not saved. Inside Macintosh suggests we should call FlushVol after FSClose, but alas, FlushVol is not apparently supported by multiversal.

[agoode]

I think this might be a problem more generally in libretro. I noticed that fopen("foo", "w"); was not properly truncating.

[agoode]

https://github.com/autc04/multiversal/pull/5

[jcreedcmu]

Fixed by above PR and 894f2be0c57f2f1a7e6981a4e979ad04197f7932 actually calling SetEOF.