Re: Add support for AArch64 EFI (efi-*-aarch64)

Re: Add support for AArch64 EFI (efi-*-aarch64)

Commit b69c9d41e8 was broken in multiple ways regarding the realloc
of the target string, most notably in that "-little" wasn't actually
appended to the input_target or output_target.  This caused asan
errors and "FAIL: Check if efi app format is recognized".  I also
noticed that the input_target string wasn't being copied but rather
the output_target when dealing with the input target.  Fix that too.

	PR 26206
	* objcopy.c (convert_efi_target): Rewrite.  Allocate modified
	target strings here..
	(copy_main): ..rather than here.  Do handle input_target,
	not output_target for input.