[dw-free] All workers need to be executable

[fu]

[commit: http://hg.dwscoalition.org/dw-free/rev/778b99a9169a]

http://bugs.dwscoalition.org/show_bug.cgi?id=3369

Make executable these workers.

Patch by fu.

Files modified:

• bin/worker/distribute-invites
• bin/worker/xpost

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