fix pulseview with newer boost

Fix taken from upstream. Brad sent the same diff to MAINTAINER.

ok bentley@ (MAINTAINER)

comms/sigrok/pulseview/Makefile

@@ -1,7 +1,7 @@
-# $OpenBSD: Makefile,v 1.4 2019/03/08 20:00:40 cwen Exp $
+# $OpenBSD: Makefile,v 1.5 2020/11/02 00:18:09 daniel Exp $
 
 COMMENT =		command-line frontend for sigrok logic analyzer
-REVISION =		1
+REVISION =		2
 
 SIGROK_PROJECT =	pulseview
 SIGROK_VERSION =	0.4.1

comms/sigrok/pulseview/patches/patch-pv_util_hpp

@@ -0,0 +1,15 @@
+$OpenBSD: patch-pv_util_hpp,v 1.1 2020/11/02 00:18:09 daniel Exp $
+
+backport commit 136b891 to work around boost + clang10 issue
+
+Index: pv/util.hpp
+--- pv/util.hpp.orig
++++ pv/util.hpp
+@@ -25,6 +25,7 @@
+ #include <vector>
+ 
+ #ifndef Q_MOC_RUN
++#include <boost/serialization/nvp.hpp>
+ #include <boost/multiprecision/cpp_dec_float.hpp>
+ #endif
+