Dropping macOS and Windows host tool builds and support in U-Boot

[Tom Rini]

Hey all,

I am wondering if at this point in time, anyone still builds our host
tools (fw_printenv / fw_getenv, a few others) to run on macOS or
Windows, natively.

I ask for two reasons. The first of which is that a reason we still have
to support Azure (despite its slowness) for CI is it's where we have
macOS and Windows hosts. But at this point in time there's so many ways
to have Linux userspace running on Windows or macOS that I don't know
that there's any value to these builds.

The second reason is more macOS specific and is that with:

commit 8fbcc0e0e839a8e25f636c76e59311033d3817b5
Author: Marek Vasut <marek.vasut+renesas at mailbox.org>
Date:   Thu Nov 13 12:54:51 2025 +0100

    boot: Assure FDT is always at 8-byte aligned address
    
    The fitImage may contain FDT at 4-byte aligned address, because alignment
    of DT tags is 4 bytes. However, libfdt and also Linux expects DT to be at
    8-byte aligned address. Make sure that the DTs embedded in fitImages are
    always used from 8-byte aligned addresses. In case the DT is decompressed,
    make sure the target buffer is 8-byte aligned. In case the DT is only
    loaded, make sure the target buffer is 8-byte aligned too.
    
    Signed-off-by: Marek Vasut <marek.vasut+renesas at mailbox.org>

Which does things we must do, we now don't build on macOS. Why? As best
I can tell (and for a general purpose OS, is a good call), memalign(..)
doesn't exist and you need to use posix_memalign, a not drop-in
replacement. We could spend some time reworking the code here for that,
but for now I've instead gone with this workaround so that CI can
continue:
https://lore.kernel.org/u-boot/20251202162250.2613085-1-trini@konsulko.com/

But longer term, unless people say they need and use these tools, I'm
inclined to remove them from CI and remove this workaround, for the
v2026.04 release.

-- 
Tom
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