Help with OS identification

Hello all-

If any of you are running Guile on anything uncommon,
I'd like to know what results you get for
(utsname:sysname (uname))
and
%host-type

In Guile's test suite, we use both interchangeably, but a PR by
Hannes says that, for MSYS, uname is a better indicator than
%host-type, since %host-type can report 'cygwin'. So, I was wondering
if there are other quirks to know about.

Right now, I'm on running on Cygwin, and I get
scheme@(guile-user)> (utsname:sysname (uname))
$2 = "CYGWIN_NT-10.0-26200"
scheme@(guile-user)> %host-type
$3 = "x86_64-pc-cygwin"

Regards,
Mike