Bug#798607: grub2: docs, mpi, and other cleanup

[Linn Crosetto]

Source: grub2
Version: 2.02~beta2-28
Severity: normal
Tags: patch

override_dh_clean does not remove all necessary files to rebuild from source
using gbp. This cleanup was part of Makefile.in before the conversion to
Automake.

Example failure message:

dpkg-source: error: cannot represent change to
grub-core/lib/libgcrypt-grub/mpi/mpih-rshift.c:
dpkg-source: error:   new version is symlink to generic/mpih-rshift.c
dpkg-source: error:   old version is plain file
[...]
dpkg-source: error: unrepresentable changes to source
dpkg-buildpackage: error: dpkg-source -i -I -b grub gave error exit status 2
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