Add blackberry backend

Change-Id: I88be743f0cad94d4beabdae917758be7e4293bfd
Reviewed-by: Sean Harmer <sean.harmer@kdab.com>
Reviewed-by: Dmytro Poplavskiy <dmytro.poplavskiy@nokia.com>

src/plugins/plugins.pro

@@ -8,6 +8,10 @@ TEMPLATE = subdirs
 
 SUBDIRS += m3u
 
+blackberry {
+    SUBDIRS += blackberry
+}
+
 win32 {
     SUBDIRS += audiocapture
 }