packages/builder: download only new sources

[Kamil Dziedzic]

Could somebody look a this and check if this doesn't break anything?

http://cvs.pld-linux.org/cgi-bin/cvsweb/packages/builder?r1=1.620&r2=1.620.2.5

Modification:
- when --try-upgrade (-u) is requested check for new version
  before geting sources, so only new sources will be downloaded

-- 
Regards, Kamil Dziedzic
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