[rygel] build: use foreign to cope with now missing README

[Jens Georg <jensgeorg src gnome org>]

commit 24e76fff70024a9f225ac168dce8053d1e3745d0
Author: Jens Georg <mail jensge org>
Date:   Wed May 30 14:36:43 2018 +0200

    build: use foreign to cope with now missing README

 README.md    | 2 +-
 configure.ac | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/README.md b/README.md
index 951e6f10..d5544281 100644
--- a/README.md
+++ b/README.md
@@ -62,7 +62,7 @@ Requirements
       * gst-plugins-bad
       * gst-plugins-ugly
 
-To build without gstreamer, use: ```--with-media-engine=simple```
+To build without gstreamer, use ```--with-media-engine=simple``` during configure time.
 This will also disable any plugins that use gstreamer.
 
 References
diff --git a/configure.ac b/configure.ac
index b4ee95b5..ee487ea4 100644
--- a/configure.ac
+++ b/configure.ac
@@ -19,7 +19,7 @@ AC_SUBST(abs_top_builddir)
 AC_SUBST(VERSION)
 
 dnl Initialize automake
-AM_INIT_AUTOMAKE([1.11.1 tar-ustar no-dist-gzip dist-xz -Wno-portability])
+AM_INIT_AUTOMAKE([1.11.1 tar-ustar no-dist-gzip dist-xz -Wno-portability foreign])
 AM_MAINTAINER_MODE([enable])
 
 dnl Initialize libtool