Add -ltb to link line.

This is part of cleaning up the name space of pubsub.  Previously, this
program was getting the "info" call from libpubsub and that version is going
to become private.  So use the one in libtb instead.

event/proxy/GNUmakefile.in

@@ -42,16 +42,16 @@ PFLAGS    = -pthread
 PFLAGS   += -DDEBUG
 PFLAGS	 += -O2 -g -Wall
 PFLAGS   += -I. -I${OBJDIR} -I$(SRCDIR)/../lib -I$(TESTBED_SRCDIR)/lib/libtb
-PFLAGS   += -L/usr/local/lib -lpubsub_r -lm
+PFLAGS   += -L/usr/local/lib -lpubsub_r -ltb -lm
 
 PLDFLAGS += -L$(OBJDIR)/lib -L$(OBJDIR)/lib/libtb -L../lib
 PLIBS     = -levent_r -ltb -lcrypto
-PLIBS    += -L/usr/local/lib -lpubsub_r -lm
+PLIBS    += -L/usr/local/lib -lpubsub_r -ltb -lm
 PLDFLAGS += $(LDSTATIC)
 
 LDFLAGS  += -L$(OBJDIR)/lib -L$(OBJDIR)/lib/libtb -L../lib
 LIBS      = -levent -ltb -lcrypto
-LIBS     += -L/usr/local/lib -lpubsub -lm
+LIBS     += -L/usr/local/lib -lpubsub -ltb -lm
 LDFLAGS  += $(LDSTATIC)
 
 # Deal with the presence/absence of kerberos in the linux ssl library
@@ -89,7 +89,7 @@ evproxyplab-debug:    evproxyplab.o ../lib/libevent.a ../lib/event.h
 
 version0_gateway:    version0_gateway.c
 	$(CC) $(CFLAGS) $(PLDFLAGS) -pthread -o $@ $< -L/usr/local/lib \
-		-lpubsub_r -lm
+		-lpubsub_r -ltb -lm
 
 eventping-debug: eventping.o
 	$(CC) $(LDFLAGS) -o $@ eventping.o -pthread $(LIBS)