[master] 989cfea Install cache_backend.h with the vmod headers

[Federico G. Schwindt]

commit 989cfea0477e285e80ab9fa4c9f82ad7b9813d16
Author: Federico G. Schwindt <fgsch at lodoss.net>
Date:   Thu Apr 10 08:26:02 2014 +0100

    Install cache_backend.h with the vmod headers

diff --git a/bin/varnishd/Makefile.am b/bin/varnishd/Makefile.am
index d9a8e62..402cd0d 100644
--- a/bin/varnishd/Makefile.am
+++ b/bin/varnishd/Makefile.am
@@ -103,6 +103,7 @@ noinst_HEADERS = \
 pkgdataincludedir = $(pkgdatadir)/include
 nobase_pkgdatainclude_HEADERS = \
 	cache/cache.h \
+	cache/cache_backend.h \
 	common/common.h \
 	common/params.h