[tracker] bump libgrss to latest 0.6

[Igor Gnatenko <ignatenko src gnome org>]

commit 69edbc76f1d964d190b23f3ffea1aa044220446c
Author: Igor Gnatenko <ignatenko src gnome org>
Date:   Tue Jul 14 16:47:53 2015 +0300

    bump libgrss to latest 0.6
    
    There are no API break since 0.5, but 0.5 doesn't work well and doesn't shipped in distros
    
    Reference: https://bugzilla.gnome.org/show_bug.cgi?id=752371
    Signed-off-by: Igor Gnatenko <ignatenko src gnome org>

 configure.ac |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index d84b5ad..d1ad1bb 100644
--- a/configure.ac
+++ b/configure.ac
@@ -225,7 +225,7 @@ EDS_REQUIRED=2.32.0
 CAMEL_REQUIRED=2.32.0
 GEE_REQUIRED=0.3
 TAGLIB_REQUIRED=1.6
-LIBGRSS_REQUIRED=0.5
+LIBGRSS_REQUIRED=0.6
 REST_REQUIRED=0.6
 NETWORK_MANAGER_REQUIRED=0.8
 GSTREAMER_REQUIRED=0.10.31
@@ -499,7 +499,7 @@ fi
 
 # Check requirements for tracker-miner-rss
 TRACKER_MINER_RSS_REQUIRED="glib-2.0     >= $GLIB_REQUIRED
-                            libgrss-0.5  >= $LIBGRSS_REQUIRED"
+                            libgrss-0.6  >= $LIBGRSS_REQUIRED"
 
 PKG_CHECK_MODULES(TRACKER_MINER_RSS, [$TRACKER_MINER_RSS_REQUIRED],
                   [have_tracker_miner_rss=yes],