Bug#772526: adjust the action of update-grub2 to bios_grub partitions

[Arthur Marsh <arthur.marsh@internode.on.net>]

Package: os-prober
Version: 1.70
Followup-For: Bug #772526

Dear Maintainer,

*** Reporter, please consider answering these questions, where appropriate ***

I'm still seeing this problem and would hope that os-prober would handle 
bios_grub partitions more intelligently (with maybe an option to try 
detecting a filesystem on a bios_grub partition).

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-- System Information:
Debian Release: stretch/sid
  APT prefers unstable
  APT policy: (500, 'unstable'), (500, 'testing'), (500, 'stable'), (500, 'oldstable'), (1, 'experimental')
Architecture: amd64 (x86_64)

Kernel: Linux 4.3.0+ (SMP w/4 CPU cores; PREEMPT)
Locale: LANG=en_AU.UTF-8, LC_CTYPE=en_AU.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash
Init: sysvinit (via /sbin/init)

Versions of packages os-prober depends on:
ii  libc6  2.19-22

os-prober recommends no packages.

os-prober suggests no packages.

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