[Bug 1876620] [NEW] Enable riscv64 build

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You have been subscribed to a public bug by Ubuntu Foundations Team Bug Bot (crichton):

RISC-V EFI support is not yet in the Linux kernel (ca. 5.8:
https://lkml.org/lkml/2020/4/20/1800), and while GRUB2 EFI Loader
support needs to happen with the kernel
(https://lists.gnu.org/archive/html/grub-devel/2020-04/msg00203.html),
GRUB2 already has RISC-V EFI support.  It can't currently boot anything,
but it is a valid UEFI application and displays a pretty menu.

Please see the attached debdiff.  Of note:

* grub2 requires efibootmgr and efivar.  I've filed Debian bugs to
enable riscv64 for them (https://bugs.debian.org/cgi-
bin/bugreport.cgi?bug=959498 and https://bugs.debian.org/cgi-
bin/bugreport.cgi?bug=959499 respectively), but if this is actioned
before those end up happening, it's a simple Architecture: update on
each.

* riscv-default-platform.patch: Upstreamed, allows `grub-install` to
work without --platform.

* riscv-relocation-offset.patch: Upstreamed, fixes "unaligned pointer"
failure.

* riscv-ubuntu-linuxefi.patch: Patches ubuntu-linuxefi.patch for riscv
support; not sure if this should be integrated into ubuntu-
linuxefi.patch.

* Tested on qemu-system-riscv64 focal.

** Affects: grub2 (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: patch
-- 
Enable riscv64 build
https://bugs.launchpad.net/bugs/1876620
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