Handle that varnishd is built after in-tree vmods

bin/varnishd/Makefile.am

@@ -154,6 +154,7 @@ vcldir=$(datarootdir)/$(PACKAGE)/vcl
 varnishd_CFLAGS = \
 	@PCRE_CFLAGS@ \
 	@SAN_CFLAGS@ \
+	-DNOT_IN_A_VMOD \
 	-DVARNISH_STATE_DIR='"${VARNISH_STATE_DIR}"' \
 	-DVARNISH_VMOD_DIR='"${pkglibdir}/vmods"' \
 	-DVARNISH_VCL_DIR='"${pkgsysconfdir}:${vcldir}"'

bin/varnishd/cache/cache_varnishd.h

@@ -41,7 +41,9 @@
 
 #include "common/common_param.h"
 
-#include "VSC_main.h"
+#ifdef NOT_IN_A_VMOD
+#  include "VSC_main.h"
+#endif
 
 /* -------------------------------------------------------------------*/