Rejig the MBR file reading logic so

1) If mbr_file is NULL use built-in mbr for -i, -u and 'reinit'.
2) If mbr_file cannot be opened issue a warning and use built-in mbr for -i,
   -u, and 'reinit'.
3) If mbr_file can't be read, bail out of fdisk.
4) Use the mbr read from mbr_file for -i, -u, and 'reinit'.

Remove inappropriate GPT dancing.

This restores pre-GPT-editing mbr_file handling and makes the logic
clearer at the expense of a tiny bit of duplication.

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