mgar check-upstream now works on unstable* hosts

[Maciej (Matchek) Bliziński]

I've modified the uwatch and gar.lib.mk code to support proxies, so now you
can run "mgar check-upstream" on unstable* hosts, and it will work, at
least with HTTP targets.

The patch was: http://sourceforge.net/p/gar/code/23641/

Maciej
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