Export VTIM_format() so varnishhist doesn't need libvarnish to get that.

bin/varnishhist/Makefile.am

@@ -17,7 +17,6 @@ varnishhist_CFLAGS = \
 varnishhist_LDADD = \
 	$(top_builddir)/lib/libvarnishcompat/libvarnishcompat.la \
 	$(top_builddir)/lib/libvarnishapi/libvarnishapi.la \
-	$(top_builddir)/lib/libvarnish/libvarnish.la \
 	-lm \
 	@SAN_LDFLAGS@ \
 	@CURSES_LIB@ ${RT_LIBS} ${PTHREAD_LIBS}

lib/libvarnishapi/libvarnishapi.map

@@ -162,3 +162,8 @@ LIBVARNISHAPI_1.5 {
 
 	VCS_Message;
 } LIBVARNISHAPI_1.0;
+
+LIBVARNISHAPI_1.6 {
+  global:
+	VTIM_format;
+} LIBVARNISHAPI_1.0;