bsd.prefs.mk OpenIndiana detection

Hi,

I'd like to commit this patch to be able to fix some PLIST issues
on OpenIndiana. pkgsrc currently detects OpenIndiana as Solaris
instead of Illumos which breaks some packages like lang/go.

--- bsd.prefs.mk	22 Oct 2025 08:37:18 -0000	1.462
+++ bsd.prefs.mk	13 Apr 2026 07:53:25 -0000
@@ -287,6 +287,14 @@ NATIVE_LOWER_VARIANT_VERSION!=	/usr/bin/
 .  elif !empty(_UNAME_V:Mtribblix-*)
 NATIVE_OS_VARIANT=		Tribblix
 NATIVE_LOWER_VARIANT_VERSION!=	/usr/bin/awk '{ print $$2; exit 0; }' /etc/release
+.  elif !empty(_UNAME_V:Millumos-*)
+NATIVE_OS_VARIANT!=		/usr/bin/awk '{ print $$1; exit 0; }' /etc/release
+.    if ${NATIVE_OS_VARIANT} == "OpenIndiana"
+NATIVE_LOWER_VARIANT_VERSION!=	/usr/bin/awk '{ print $$3; exit 0; }' /etc/release
+.    else
+NATIVE_OS_VARIANT=		Solaris
+NATIVE_LOWER_VARIANT_VERSION=	${_UNAME_V}
+.    endif
 .  else
 NATIVE_OS_VARIANT=		Solaris
 NATIVE_LOWER_VARIANT_VERSION=	${_UNAME_V}

How this would affect pkgsrc:

Before:

# uname -v
illumos-5d086a7886
# head -n 1 /etc/release
             OpenIndiana Hipster 2025.10 (powered by illumos)
# /opt/pbulk/bin/bmake show-var VARNAME=OPSYS
SunOS
# /opt/pbulk/bin/bmake show-var VARNAME=OS_VARIANT
Solaris
# /opt/pbulk/bin/bmake show-var VARNAME=NATIVE_LOWER_VARIANT_VERSION
illumos-5d086a7886

After:

# /opt/pbulk/bin/bmake show-var VARNAME=OS_VARIANT
OpenIndiana
# /opt/pbulk/bin/bmake show-var VARNAME=NATIVE_LOWER_VARIANT_VERSION
2025.10

Any objections?

Kind regards,
-Tobias