gnu: Add syncthing.

[Petter]

Hi,

Syncthing is the first project to use the recently added Go build
system. It's in a minimal state to aid in developing the build system
and because it's a considerable job to add descriptions, synopsises
and homepages to all these packages (55). Licenses are probably
incorrect, unless correct by coincidence. Help with this would be most
appreciated!

Tar archives are currently unsupported.

Best,
Petter

0001-gnu-Add-syncthing.patch
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