Support boot entries for x86_64 systems with IA32 UEFI

[nl6720]

With limine.conf containing boot entries such as:

/Test x64 EFI entry
	protocol: efi
	path: boot():/EFI/limine/BOOTX64.EFI
	if_fw_type: UEFI
	if_arch: x86-64

/Test IA32 EFI entry
	protocol: efi
	path: boot():/EFI/limine/BOOTIA32.EFI
	if_fw_type: UEFI
	if_arch: ia-32

Limine IA32 EFI binary shows the "Test x64 EFI entry" instead of the "Test IA32 EFI entry". While this is expected, according to https://github.com/Limine-Bootloader/Limine/blob/trunk/CONFIG.md#built-in-macros, this means there is no way to create boot entries specific to x86_64 systems with IA32 UEFI.

Related to #537