Fix typo

git-svn-id: http://www.varnish-cache.org/svn/trunk/varnish-cache@5486 d4fa192b-c00b-0410-8231-f00ffab90ce4

bin/varnishd/Makefile.am

@@ -119,7 +119,7 @@ mgt_vcc.c:	default_vcl.h
 
 varnishd.1: $(top_srcdir)/doc/sphinx/reference/varnishd.rst
 if HAVE_RST2MAN
-	${RST2MAN} $? @
+	${RST2MAN} $? $@
 else
 	@echo "========================================"
 	@echo "You need rst2man installed to make dist"