iucode-tool: fix host-compile on macos and non-x86 linux

iucode-tool: fix host-compile on macos and non-x86 linux

iucode-tool/host is used by intel-microcode to manipulate with
microcode.bin file. iucode-tool requires cpuid.h at compile time
for autodection feature, but non-x86 build hosts does not have
this header file (e.g. ubuntu 20.04 aarch64) or this header
generates compile time error (#error macro) (e.g. macos arm64).

This patch provides compat cpuid.h to build iucode-tool/host on
non-x86 linux hosts and macos. CPU autodectection is not required
for intel-microcode package build so compat cpuid.h is ok for
OpenWrt purposes.

glibc and argp lib are not present in macos so iucode-tool/host
build fails. This patch adds argp-standalone/host as build
dependency if host os is macos.

Generated ucode (intel-microcode package) is exactly the same on
Linux x86_64 (Ubuntu 20.04), Linux aarch64 (Ubuntu 20.04) and
Darwin arm64 (MacOS 11.6) build hosts.

Signed-off-by: Sergey V. Lobanov <sergey@lobanov.in>