[gupnp-tools] build: Silence "GNU extension" warnings

[Jens Georg <jensgeorg src gnome org>]

commit 57c398e537e2a3f20adcedfba17d5d7f48a271e8
Author: Jens Georg <mail jensge org>
Date:   Fri Dec 16 16:51:42 2016 +0100

    build: Silence "GNU extension" warnings
    
    Signed-off-by: Jens Georg <mail jensge org>

 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index fee3ba6..00ba51a 100644
--- a/configure.ac
+++ b/configure.ac
@@ -10,7 +10,7 @@ AC_CONFIG_SRCDIR(src/common/icons.h)
 AC_CONFIG_MACRO_DIR([m4])
 AC_CONFIG_AUX_DIR([build-aux])
 
-AM_INIT_AUTOMAKE([1.11 tar-ustar no-dist-gzip dist-xz])
+AM_INIT_AUTOMAKE([1.11 tar-ustar no-dist-gzip dist-xz foreign])
 AM_MAINTAINER_MODE([enable])
 AM_SILENT_RULES([yes])