Remove NoArrayLength usage

Solves the following build error:
make[3]: Entering directory '/home/elmarco/src/gnome/rygel/src/rygel'
  VALAC    rygel_vala.stamp
  rygel-cmdline-config.vala:40.6-40.18: warning: attribute
  `NoArrayLength' never used
      [NoArrayLength]
           ^^^^^^^^^^^^^
           rygel-cmdline-config.vala:63.6-63.18: warning: attribute
  `NoArrayLength' never used
      [NoArrayLength]
           ^^^^^^^^^^^^^
           rygel-cmdline-config.vala:66.6-66.18: warning: attribute
  `NoArrayLength' never used
      [NoArrayLength]
           ^^^^^^^^^^^^^
           rygel-cmdline-config.vala:69.6-69.18: warning: attribute
  `NoArrayLength' never used
      [NoArrayLength]
           ^^^^^^^^^^^^^
Compilation failed: 0 error(s), 4 warning(s)
Makefile:791: recipe for target 'rygel_vala.stamp' failed

https://bugzilla.gnome.org/show_bug.cgi?id=741913