Support aarch64 for GRUB and Limine EFI installation#4641
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On aarch64 both the GRUB and Limine installers assume x86 and fail. GRUB names its EFI target 'arm64', but platform.machine() returns 'aarch64', so passing --target=aarch64-efi is rejected. Map aarch64 to the arm64 target name expected by grub-install. Limine ships architecture-specific default EFI binaries: BOOTAA64.EFI on aarch64 versus BOOTIA32.EFI and BOOTX64.EFI on x86. Select the correct binaries in the three places that reference them: when copying them into the ESP, when building the pacman hook that refreshes them on update, and when choosing the 64-bit EFI boot menu loader path.
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On aarch64 both the GRUB and Limine installers assume x86 and fail.
GRUB names its EFI target 'arm64', but platform.machine() returns 'aarch64', so passing --target=aarch64-efi is rejected. Map aarch64 to the arm64 target name expected by grub-install.
Limine ships architecture-specific default EFI binaries: BOOTAA64.EFI on aarch64 versus BOOTIA32.EFI and BOOTX64.EFI on x86. Select the correct binaries in the three places that reference them: when copying them into the ESP, when building the pacman hook that refreshes them on update, and when choosing the 64-bit EFI boot menu loader path.
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