evolution: improved to disable audio-inline plugin if no gstreamer is installed

gnome2/evolution/evolution.conf

@@ -56,3 +56,8 @@ export libsuff=${libdir##*/lib}
 if ! pkginstalled -f libpst; then
 	var_append extraconfopt ' ' "--disable-pst-import"
 fi
+
+# disable audio-inline plugin if no gstreamer is installed
+if ! pkginstalled -f gstreamer; then
+	var_append extraconfopt ' ' "--disable-audio-inline"
+fi