net/spread: Add \todo to deal with LICENSE

This is slightly tricky because the license is BSDish with extra
terms, and I'd give even odds Debian is or isn't ok with it.

(I don't see any reason to set NO_*_ON_*.)

net/spread/Makefile

@@ -1,4 +1,4 @@
-# $NetBSD: Makefile,v 1.36 2019/11/03 11:45:53 rillig Exp $
+# $NetBSD: Makefile,v 1.37 2020/08/30 15:38:50 gdt Exp $
 #
 
 DISTNAME=	spread-src-3.17.3
@@ -10,6 +10,9 @@ MASTER_SITES=	http://www.cnds.jhu.edu/download/noformdown/
 MAINTAINER=	pkgsrc-users@NetBSD.org
 HOMEPAGE=	http://www.spread.org/
 COMMENT=	Group communication system providing a number of messaging services
+# \todo Deal with LICENSE.
+#   - Is the license acceptable to Debian?  (Seems like that could go either way.)
+#   - Put license in licenses and add a line.
 
 WRKSRC=			${WRKDIR}/${DISTNAME}
 USE_GCC_RUNTIME=	yes