Add GStreamer version check in acinclude.m4

Since commit cc04c6a2f7500f3d29d56634e645130ff3bd80fb compilation fails
with GStreamer 0.10.28 or older.
diff --git a/acinclude.m4 b/acinclude.m4
index 91e0956..6aaa885 100644
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -115,7 +115,8 @@
 ])
 
 AC_DEFUN([AC_PATH_GSTREAMER], [
-	PKG_CHECK_MODULES(GSTREAMER, gstreamer-0.10 gstreamer-plugins-base-0.10, gstreamer_found=yes, gstreamer_found=no)
+	PKG_CHECK_MODULES(GSTREAMER, gstreamer-0.10 >= 0.10.30 gstreamer-plugins-base-0.10, gstreamer_found=yes,
+				AC_MSG_WARN(GStreamer library version 0.10.30 or later is required);gstreamer_found=no)
 	AC_SUBST(GSTREAMER_CFLAGS)
 	AC_SUBST(GSTREAMER_LIBS)
 	GSTREAMER_PLUGINSDIR=`$PKG_CONFIG --variable=pluginsdir gstreamer-0.10`