Processed: remove grub-legacy support

[Debian Bug Tracking System]

Processing control commands:

> block 1086750 by -1
Bug #1086750 [src:grub] grub-installer still uses old grub-legacy
1086750 was not blocked by any bugs.
1086750 was not blocking any bugs.
Added blocking bug(s) of 1086750: 1086840

-- 
1086750: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1086750
1086840: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1086840
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