Bug#1059991: grub-installer: build loong64.udeb for loongarch64

[zhangdandan <zhangdandan@loongson.cn>]

Source: grub-installer
Version: 1.197
Severity: wishlist
Tags: patch
User: debian-loongarch@lists.debian.org
Usertags: loong64

Dear maintainers,

We need to add build support for loongarch64 in debian/control.
Please consider the patch I have attached.

The grub-installer source package was compiled successfully on my local 
environment.
I integrated grub-installer_1.197_loong64.udeb in my local DVD iso. When 
installing the DVD iso through debian-installer, grub2 software packages 
can be installed normally.
If you have any questions, you can contact me at any time.

thanks,
Dandan Zhang

diff -Nru grub-installer-1.197/debian/control grub-installer-1.197/debian/control
--- grub-installer-1.197/debian/control	2023-09-20 11:00:26.000000000 +0000
+++ grub-installer-1.197/debian/control	2023-09-20 11:00:26.000000000 +0000
@@ -8,7 +8,7 @@
 Vcs-Git: https://salsa.debian.org/installer-team/grub-installer.git
 
 Package: grub-installer
-Architecture: amd64 arm64 armhf i386 ia64 hurd-i386 kfreebsd-i386 kfreebsd-amd64 mipsel powerpc ppc64 ppc64el sparc sparc64
+Architecture: amd64 arm64 armhf i386 ia64 hurd-i386 kfreebsd-i386 kfreebsd-amd64 loong64 mipsel powerpc ppc64 ppc64el sparc sparc64
 XB-Subarchitecture: ${subarch}
 Provides: bootable-system
 Depends: ${shlibs:Depends}, ${misc:Depends}, kernel-installer, created-fstab, di-utils, di-utils-mapdevfs, os-prober, partman-utils