[sound-juicer] Add --enable--appstream-util to DISTCHECK_CONFIGURE_FLAGS

[Phillip Wood <pwood src gnome org>]

commit 0f17082bacf3e595f91805ffc8c19b45a0e6760d
Author: Phillip Wood <phillip wood dunelm org uk>
Date:   Tue Jun 14 10:26:46 2016 +0100

    Add --enable--appstream-util to DISTCHECK_CONFIGURE_FLAGS
    
    This is recommended to ensure the appdata file is validated during
    distcheck.

 Makefile.am      |    1 +
 data/Makefile.am |    1 +
 2 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/Makefile.am b/Makefile.am
index 14500e3..edf0a92 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -7,6 +7,7 @@ CLEANFILES =
 DISTCLEANFILES =
 EXTRA_DIST =
 MAINTAINERCLEANFILES =
+DISTCHECK_CONFIGURE_FLAGS =
 
 sound_juicer_CPPFLAGS = \
        -I$(top_srcdir)/libjuicer \
diff --git a/data/Makefile.am b/data/Makefile.am
index 050fe04..9f368b7 100644
--- a/data/Makefile.am
+++ b/data/Makefile.am
@@ -8,6 +8,7 @@ $(desktop_DATA): data/sound-juicer.desktop.in
                --keyword=GenericName --keyword=Comment --keyword=Keywords   \
                --template $< -d $(top_srcdir)/po -o $@
 
+DISTCHECK_CONFIGURE_FLAGS += --enable-appstream-util
 @APPSTREAM_XML_RULES@
 appstream_XML = $(appstream_in_files:.xml.in=.xml)
 appstream_in_files = data/appdata/sound-juicer.appdata.xml.in