i386: make struct linux_kernel_header architecture specific

i386: make struct linux_kernel_header architecture specific

struct linux_kernel_header -> struct linux_i386_kernel_header

Signed-off-by: Leif Lindholm <leif.lindholm@linaro.org>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
Origin: upstream, https://git.savannah.gnu.org/cgit/grub.git/commit/?id=7d36709d5e769eb49b41cca709bd64336b47ab4f
Bug-Debian: https://bugs.debian.org/907596
Bug-Debian: https://bugs.debian.org/909420
Last-Update: 2018-12-06

Patch-Name: i386-linux_kernel_header-arch-specific.patch

Gbp-Pq: Name i386-linux_kernel_header-arch-specific.patch