Improve support for genkernel in 10_linux

[Mike Gilbert]

Gentoo Linux maintains its own kernel builder and initramfs generation
utility called "genkernel".

It looks like some attempt was made to make 10_linux compatible with
initiramfs images created by genkernel. However, this support is
currently broken. There are two problems.


Firstly, genkernel initramfs images are named like so:

initramfs-genkernel-$ARCH-$version

10_linux currently looks for this:

initramfs-genkernel-$version

The simplest solution here would be to use a wildcard beteen genkernel
and $version.


Secondly, genkernel looks for the "real_root" kernel command line option
to determine the root filesystem. This is a holdover from the days when
we used true initrd images and we needed to use root=/dev/ram0.


I have attached a rough patch that resolves these issues. I would
appreciate any feedback you can give me. My goal is to move this
upstream so that I will not have to rebase it in the future.

grub-2.00-10_linux-genkernel.patch
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