SPECS: mirrors - added 'Open Source Development Network' dl

[Andrzej Krzysztofowicz]

Jakub Bogusz wrote:
> 
> BTW, shouldn't all mirror entries be disabled by default?
> Enabling some mirror is an individual choice.

Do dl.sourceforge.net URLs in spec work without any mirror?
Some programs need them to be working automatically.

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  Andrzej M. Krzysztofowicz               ankry at mif.pg.gda.pl
  phone (48)(58) 347 14 61
Faculty of Applied Phys. & Math.,   Gdansk University of Technology