x86/tools: Drop x86_64 support from 'relocs' tool The relocs tool is no longer used on vmlinux, which is the only 64-bit ELF executable that it used to operate on in the 64-bit build. (It is still used for parts of the decompressor) So drop the 64-bit handling - it is dead code now. Signed-off-by: Ard Biesheuvel <ardb@kernel.org>