[tracker] tracker-extract: Fix build with libav when libmediaaart is disabled

[Martyn James Russell <mr src gnome org>]

commit 3a360934d4520db279490e1c5c929aa61916ac90
Author: Martyn Russell <martyn lanedo com>
Date:   Thu Jun 5 10:08:30 2014 +0100

    tracker-extract: Fix build with libav when libmediaaart is disabled
    
    https://bugzilla.gnome.org/show_bug.cgi?id=728370

 src/tracker-extract/tracker-extract-libav.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/src/tracker-extract/tracker-extract-libav.c b/src/tracker-extract/tracker-extract-libav.c
index fea30a3..c14998b 100644
--- a/src/tracker-extract/tracker-extract-libav.c
+++ b/src/tracker-extract/tracker-extract-libav.c
@@ -26,7 +26,9 @@
 
 #include <libtracker-extract/tracker-extract.h>
 
+#ifdef HAVE_LIBMEDIAART
 #include <tracker-media-art.h>
+#endif
 
 #include <libavcodec/avcodec.h>
 #include <libavformat/avformat.h>
@@ -327,6 +329,7 @@ tracker_extract_get_metadata (TrackerExtractInfo *info)
                        g_free (album_uri);
                }
 
+#ifdef HAVE_LIBMEDIAART
                media_art_process (NULL,
                                   0,
                                   NULL,
@@ -334,6 +337,7 @@ tracker_extract_get_metadata (TrackerExtractInfo *info)
                                   album_artist,
                                   album_title,
                                   uri);
+#endif
 
                g_free(performer_uri);
        }