Cherry pick trunk@13760 to remove boost::system
per https://marc.info/?l=openbsd-ports&m=177038373917003&w=2

Index: src/plugins/contrib/NassiShneiderman/Makefile.am
--- src/plugins/contrib/NassiShneiderman/Makefile.am.orig
+++ src/plugins/contrib/NassiShneiderman/Makefile.am
@@ -1,8 +1,7 @@
 AM_CPPFLAGS = $(WX_CXXFLAGS) \
 		-I$(top_srcdir)/src/include \
 		-I$(top_srcdir)/src/sdk/wxscintilla/include \
-		$(BOOST_CPPFLAGS) \
-		-DBOOST_SYSTEM_NO_DEPRECATED
+		$(BOOST_CPPFLAGS)
 
 pluginlibdir = $(pkglibdir)/plugins
 
@@ -10,7 +9,7 @@ pluginlib_LTLIBRARIES = libNassiShneiderman.la
 
 libNassiShneiderman_la_LDFLAGS = @MODULE_SHARED_LDFLAGS@ -version-info 0:1:0 -no-undefined -avoid-version
 
-libNassiShneiderman_la_LIBADD = ../../../sdk/libcodeblocks.la $(WX_LIBS) $(BOOST_LDFLAGS) $(BOOST_SYSTEM_LIB)
+libNassiShneiderman_la_LIBADD = ../../../sdk/libcodeblocks.la $(WX_LIBS)
 
 libNassiShneiderman_la_SOURCES = bricks.cpp \
 		cbEditorPanel.cpp \
