Make sure to distribute vre.h too

git-svn-id: http://www.varnish-cache.org/svn/trunk@4429 d4fa192b-c00b-0410-8231-f00ffab90ce4

include/Makefile.am

@@ -40,6 +40,7 @@ nobase_noinst_HEADERS = \
 	vev.h \
 	vlu.h \
 	vbm.h \
+	vre.h \
 	vrt.h \
 	vrt_obj.h \
 	vss.h